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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
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income $ 128,470 $ 107,769 $ 329,530 $ 266,062
Other comprehensive income, net of tax:        
Change in value of derivatives 20 21 61 63
Other comprehensive income 20 21 61 63
Comprehensive income $ 128,490 $ 107,790 $ 329,591 $ 266,125