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Long-Term Obligations (2007 Credit Agreement) (Details)
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6 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2011
USD ($)
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Mar. 25, 2011
Credit Agreement 2007 [Member]
USD ($)
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Jun. 30, 2011
Credit Agreement 2007 [Member]
USD ($)
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Dec. 31, 2010
Credit Agreement 2007 [Member]
USD ($)
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Oct. 12, 2007
Credit Agreement 2007 [Member]
CAD
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Oct. 12, 2007
Credit Agreement 2007 [Member]
USD ($)
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Oct. 12, 2007
Credit Agreement 2007 [Member]
Dual Currency Revolving Credit Facility [Member]
USD ($)
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Oct. 12, 2007
Credit Agreement 2007 [Member]
Dual Currency Letter of Credit [Member]
USD ($)
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Dec. 31, 2010
Credit Agreement 2007 [Member]
Maximum [Member]
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Dec. 31, 2010
Credit Agreement 2007 [Member]
Minimum [Member]
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| Credit agreement maturity date | Oct. 12, 2013 | |||||||||
| Term loan | $ 590,100,000 | 40,000,000 | $ 610,000,000 | |||||||
| Borrowings | 85,000,000 | 15,000,000 | ||||||||
| Letters of credit | 35,000,000 | 10,000,000 | ||||||||
| Increase in revolving credit facility borrowings, maximum | 100,000,000 | |||||||||
| Repayment of debt | 591,100,000 | |||||||||
| Write-off of the unamortized balance of capitalized debt issuance costs | 5,345,000 | 5,300,000 | ||||||||
| Weighted-average interest rates | 3.97% | |||||||||
| Commitment fees on the unused portion of our revolving credit facilities | 0.50% | 0.38% | ||||||||
| Current maturities, senior secured credit facility | $ 50,000,000 | |||||||||