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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income $ 83,300 $ 54,971
Other comprehensive income, net of tax:    
Change in value of derivatives 21 21
Other comprehensive income 21 21
Comprehensive income $ 83,321 $ 54,992