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Stock-Based Compensation - Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock-Based Compensation      
Non-cash, stock-based compensation $ 29,941 $ 13,037 $ 19,199
Subscriber-related      
Stock-Based Compensation      
Non-cash, stock-based compensation 3,323 694 2,164
General and administrative      
Stock-Based Compensation      
Non-cash, stock-based compensation 26,618 $ 12,343 $ 17,035
Non-Performance Based Stock Awards      
Share-based expenses      
Unrecognized compensation expense $ 22,000    
Share-based compensation additional disclosures      
Weighted average period for recognition of compensation cost 2 years