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Long-Term Debt (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 9 Months Ended | ||||||||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Sep. 30, 2013
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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Apr. 24, 2012
Syndicated Credit Agreement [Member]
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Sep. 30, 2013
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
Syndicated Credit Agreement [Member]
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Sep. 30, 2013
Term loan
Syndicated Credit Agreement [Member]
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Apr. 24, 2012
Term loan
Syndicated Credit Agreement [Member]
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Sep. 30, 2013
Line of Credit [Member]
Syndicated Credit Agreement [Member]
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Sep. 30, 2013
Minimum [Member]
Syndicated Credit Agreement [Member]
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Apr. 24, 2012
Minimum [Member]
Syndicated Credit Agreement [Member]
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Sep. 30, 2013
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 | |||||||||||||||||||||
| Secured rate | 100.00% | 65.00% | ||||||||||||||||||||
| Maximum borrowing capacity | 850,000,000 | |||||||||||||||||||||
| Long-term Debt | 243,750,000 | 250,000,000 | 243,750,000 | 250,000,000 | 250,000,000 | 250,000,000 | 250,000,000 | |||||||||||||||
| Deferred Finance Costs, Noncurrent, Net | 5,500,000 | |||||||||||||||||||||
| Maximum leverage ratio, required | 3.00 | |||||||||||||||||||||
| Minimum interest coverage ratio, required | 3.00 | |||||||||||||||||||||
| Actual leverage ratio | 0.75 | |||||||||||||||||||||
| Actual interest coverage ratio | 58.72 | |||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 1.50% | 2.25% | ||||||||||||||||||||
| Debt Instrument, Interest Rate, Effective Percentage | 1.68% | 0.50% | 1.25% | |||||||||||||||||||
| Line of Credit Facility, Commitment Fee Percentage | 0.25% | 0.40% | ||||||||||||||||||||
| Letters of Credit Outstanding, Amount | 36,700,000 | |||||||||||||||||||||
| Line of Credit Facility, Remaining Borrowing Capacity | 313,300,000 | |||||||||||||||||||||
| Senior notes due 2016 | 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 | 0 | 18,309,000 | 0 | 18,627,000 | 18,300,000 | |||||||||||||||||
| Redemption Premium | 13,500,000 | |||||||||||||||||||||
| Write off of Deferred Debt Issuance Cost | $ 4,800,000 | |||||||||||||||||||||