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Long-Term Debt (Narrative) (Details) (USD $)
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6 Months Ended | 0 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2011
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Dec. 31, 2010
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Jun. 30, 2010
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Jul. 25, 2008
Secured Credit Agreement Expiring July 25, 2013 [Member]
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Jun. 30, 2011
Secured Credit Agreement Expiring July 25, 2013 [Member]
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Jun. 30, 2011
Secured Credit Agreement Expiring July 25, 2013 [Member]
Revolving Credit Facility [Member]
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Jul. 25, 2008
Secured Credit Agreement Expiring July 25, 2013 [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2011
Secured Credit Agreement Expiring July 25, 2013 [Member]
Term Loan [Member]
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Jul. 25, 2008
Secured Credit Agreement Expiring July 25, 2013 [Member]
Term Loan [Member]
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Jul. 28, 2008
11.25% Senior Notes due August 1, 2016; Interest Payable each February 1st and August 1st [Member]
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Jun. 30, 2011
11.25% Senior Notes due August 1, 2016; Interest Payable each February 1st and August 1st [Member]
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Dec. 31, 2010
11.25% Senior Notes due August 1, 2016; Interest Payable each February 1st and August 1st [Member]
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Jun. 30, 2010
11.25% Senior Notes due August 1, 2016; Interest Payable each February 1st and August 1st [Member]
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| Term loan | $ 150,000,000 | ||||||||||||
| Revolving credit facility | 150,000,000 | ||||||||||||
| Percentage above LIBOR interest rate | 2.00% | ||||||||||||
| Interest rate at end of period | 2.19% | ||||||||||||
| Maximum leverage ratio, required | 2.75 | ||||||||||||
| Minimum interest coverage ratio, required | 3.00 | ||||||||||||
| Actual leverage ratio | 1.13 | ||||||||||||
| Actual interest coverage ratio | 9.32 | ||||||||||||
| Outstanding commercial and standby letters of credit issued under revolving credit facility | 27,700,000 | ||||||||||||
| Remaining borrowing capacity under revolving credit facility | 122,300,000 | ||||||||||||
| Annual fee on revolving credit facility portion of credit agreement | 0.50% | ||||||||||||
| Senior notes due 2016 | 240,000,000 | 240,000,000 | 240,000,000 | 240,000,000 | 240,000,000 | 240,000,000 | 240,000,000 | ||||||
| Subordinated borrowing, interest rate | 11.25% | 11.25% | |||||||||||
| Unamortized discount of Senior Notes | 986,000 | 1,083,000 | 1,181,000 | 1,600,000 | |||||||||
| Other issuance expenses | $ 7,300,000 | $ 7,300,000 | |||||||||||
| Maturity description | five-year maturity | eight-year term of the Senior Notes |