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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income (loss) | $ 23,327 | $ 10,042 | $ 53,535 | $ 58,719
Other comprehensive income (loss) before taxes: |  |  |  |
Change in fair value of interest rate swap agreements | 350 | (194) | 13,377 | (133)
Provision for income tax benefit (expense) related to: |  |  |  |
Change in fair value of interest rate swap agreements | (133) | 72 | (5,083) | 50
Other comprehensive income (loss) | 217 | (122) | 8,294 | (83)
Comprehensive income (loss) | $ 23,544 | $ 9,920 | $ 61,829 | $ 58,636

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