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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]      
Net income $ 494,090 $ 474,338 $ 2,620,116
Other comprehensive income, net of tax:      
Change in value of derivatives 81 105 197
Other comprehensive income 81 105 197
Comprehensive income $ 494,171 $ 474,443 $ 2,620,313