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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ 92,983 | $ 93,193 | $ 86,311
Other comprehensive income (loss) before taxes: |  |  |
Change in fair value of interest rate swap and rate cap agreements | 6,186 | 5,731 | 540
Pension actuarial income (loss) | (429) | (295) | 737
Total other comprehensive income (loss) before taxes | 5,757 | 5,436 | 1,277
Provision for income tax benefit (expense) related to components of other comprehensive income (loss) | (2,188) | (2,066) | (485)
Other comprehensive income (loss) | 3,569 | 3,370 | 792
Comprehensive income (loss) | $ 96,552 | $ 96,563 | $ 87,103

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