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Segment Reporting - Subtotal Segment Adjusted EBITDA (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting [Abstract]    
Adjusted EBITDA $ 37,100 $ 48,163
Depreciation and amortization (32,593) (35,731)
Stock-based compensation, including related taxes (3,868) (2,875)
Interest and other income (expense), net 862 (533)
Provision for income taxes (1,421) (3,369)
Net income 80 5,655
Revenue 67,121 75,415
Cost of revenue 42,230 44,130
Selling, general and administrative expenses $ 24,252 $ 21,728