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Business Combination Pro Forma (Details) - UniRush, LLC [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]    
Net revenues $ 573,347 $ 494,834
Net income attributable to common stock $ 99,858 $ 52,737
Earnings per share, basic (in dollars per share) $ 1.93 $ 1.05
Earnings per share, diluted (in dollars per share) $ 1.84 $ 1.00
Basic weighted-average common shares issued and outstanding 51,774 50,234
Diluted weighted-average common shares issued and outstanding 54,301 52,577