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Long-Term Debt (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Syndicated Credit Agreement [Member]
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Aug. 02, 2012
Eleven Point Two Five Percent Senior Notes [Member]
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Jul. 28, 2008
Eleven Point Two Five Percent Senior Notes [Member]
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Dec. 31, 2012
Eleven Point Two Five Percent Senior Notes [Member]
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Apr. 24, 2012
Syndicated Credit Agreement [Member]
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Dec. 31, 2012
Syndicated Credit Agreement [Member]
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Jul. 31, 2012
Syndicated Credit Agreement [Member]
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Jul. 31, 2012
Syndicated Credit Agreement [Member]
Eleven Point Two Five Percent Senior Notes [Member]
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Apr. 24, 2012
Voting Equity Securities Of H S Ni U S Subsidiaries [Member]
Syndicated Credit Agreement [Member]
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Apr. 24, 2012
Voting Equity Securities Of First Tier Subsidiaries [Member]
Syndicated Credit Agreement [Member]
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Apr. 24, 2012
Revolving Credit Facility [Member]
Syndicated Credit Agreement [Member]
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Dec. 31, 2012
Term Loan [Member]
Syndicated Credit Agreement [Member]
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Apr. 24, 2012
Term Loan [Member]
Syndicated Credit Agreement [Member]
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Dec. 31, 2012
Line of Credit [Member]
Syndicated Credit Agreement [Member]
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Dec. 31, 2012
Minimum [Member]
Syndicated Credit Agreement [Member]
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Apr. 24, 2012
Minimum [Member]
Syndicated Credit Agreement [Member]
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Dec. 31, 2012
Maximum [Member]
Syndicated Credit Agreement [Member]
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Apr. 24, 2012
Maximum [Member]
Syndicated Credit Agreement [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||
| Revolving credit facility | $ 600,000,000 | $ 350,000,000 | $ 250,000,000 | |||||||||||||||||||
| Term of debt | 5 years | 5 years | ||||||||||||||||||||
| Secured rate | 100.00% | 65.00% | ||||||||||||||||||||
| Maximum borrowing capacity | 850,000,000 | |||||||||||||||||||||
| Long-term Debt | 250,000,000 | 239,111,000 | 250,000,000 | 250,000,000 | ||||||||||||||||||
| Deferred Finance Costs, Noncurrent, Net | 5,500,000 | |||||||||||||||||||||
| Maximum leverage ratio, required | 3 | |||||||||||||||||||||
| Minimum interest coverage ratio, required | 3 | |||||||||||||||||||||
| Actual leverage ratio | 0.80 | |||||||||||||||||||||
| Actual interest coverage ratio | 16.72 | |||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 1.50% | 2.25% | ||||||||||||||||||||
| Debt Instrument, Interest Rate, Effective Percentage | 1.72% | 0.50% | 1.25% | |||||||||||||||||||
| Line of Credit Facility, Commitment Fee Percentage | 0.25% | 0.40% | ||||||||||||||||||||
| Letters of Credit Outstanding, Amount | 29,200,000 | |||||||||||||||||||||
| Line of Credit Facility, Remaining Borrowing Capacity | 320,800,000 | |||||||||||||||||||||
| Senior notes due 2016 | 0 | 240,000,000 | 240,000,000 | |||||||||||||||||||
| Subordinated borrowing, interest rate | 11.25% | |||||||||||||||||||||
| Repayments of debt, maturing in more than three months | 253,500,000 | |||||||||||||||||||||
| Call Price | 105.625% | |||||||||||||||||||||
| Loss on debt extinguishment | (18,300,000) | 18,627,000 | 0 | 0 | 18,600,000 | |||||||||||||||||
| Redemption Premium | 13,500,000 | |||||||||||||||||||||
| Write off of Deferred Debt Issuance Cost | $ 5,100,000 | |||||||||||||||||||||