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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statements of Comprehensive Income [Abstract]      
Net income $ 34,802 $ 40,023 $ 46,356
Other comprehensive income:      
Change in fair value of derivative instrument, net of income tax   (88) 60
Comprehensive income $ 34,802 $ 39,935 $ 46,416