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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 31,359 $ 24,640 $ 50,504 $ 41,345
Other comprehensive income (loss):        
Change in unrealized gain (loss) on valuation of interest rate swap agreements (14,367) (10,864) (12,973) (30,235)
Other comprehensive income (loss) (14,367) (10,864) (12,973) (30,235)
Comprehensive income (loss) $ 16,992 $ 13,776 $ 37,531 $ 11,110