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Business Combinations - Proforma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 7 Months Ended 12 Months Ended
May 16, 2016
Jan. 01, 2015
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition, Pro Forma Information [Abstract]            
Revenue         $ 356,138 $ 390,576
Net income attributable to Company's common stockholders         $ 51,782 $ 72,707
Basic pro forma income per share (in dollars per share)         $ 0.47 $ 0.67
Diluted pro forma income per share (in dollars per share)         $ 0.47 $ 0.67
Revenue of acquiree since acquisition date     $ 5,300      
Gain on remeasurement of existing membership interest in businesses acquired   $ 5,000   $ 0 $ 5,052 $ 0
Gain on bargain purchase on businesses acquired $ 65 100   $ 0 $ 65 $ 0
Related income tax expense on gain recognized   $ 2,100        
RBMI, RBDHC            
Business Acquisition, Pro Forma Information [Abstract]            
Gain on bargain purchase on businesses acquired $ 100