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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ 76,254 | $ 89,929 | $ 31,548
Other comprehensive income (loss) before taxes: |  |  |
Change in fair value of interest rate swap agreements | (4,019) | 5,914 | 18,539
Discontinuance of interest rate swap agreements |  |  | 4,502
Change in pension actuarial income (loss) | (508) |  |
Total other comprehensive income (loss) before taxes | (4,527) | 5,914 | 23,041
Provision for income tax benefit (expense) related to components of other comprehensive income (loss) | 1,720 | (2,247) | (8,756)
Other comprehensive income (loss) | (2,807) | 3,667 | 14,285
Comprehensive income (loss) | $ 73,447 | $ 93,596 | $ 45,833

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