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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income $ 177,539 $ 128,470 $ 369,807 $ 329,530
Other comprehensive income, net of tax:        
Change in value of derivatives 20 20 61 61
Other comprehensive income 20 20 61 61
Comprehensive income $ 177,559 $ 128,490 $ 369,868 $ 329,591