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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 14,137 $ 9,532 $ 29,184 $ 22,899
Other comprehensive loss, net of tax:        
Company sponsored benefit plans: (39) (17) (120) (52)
Change in equity method investments 0 0 0 (4)
Other comprehensive loss (39) (17) (120) (56)
Comprehensive income $ 14,098 $ 9,515 $ 29,064 $ 22,843