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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income $ 170,751 $ 91,518
Other comprehensive income, net of tax:    
Change in value of derivatives 21 21
Other comprehensive income 21 21
Comprehensive income $ 170,772 $ 91,539