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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 32,897 $ 26,085 $ 74,242 $ 60,558
Other comprehensive income (loss):        
Change in unrealized gain (loss) on valuation of interest rate swap agreements 930 (4,384) (29,305) (4,384)
Other comprehensive income (loss) 930 (4,384) (29,305) (4,384)
Comprehensive income $ 33,827 $ 21,701 $ 44,937 $ 56,174