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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income $ 166,757 $ 170,751
Other comprehensive income, net of tax:    
Change in value of derivatives 25 21
Other comprehensive income 25 21
Comprehensive income (loss) $ 166,782 $ 170,772