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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 56,479 $ 35,640 $ 10,191
Charged (Credited) to Costs and Expenses 50,691 23,698 25,342
Charged to Other Accounts   (2,291) 325
Deductions (91) (568) (218)
Balance at End of Period 107,079 56,479 35,640
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 206 731 2,438
Charged (Credited) to Costs and Expenses 171 43 (1,814)
Charged to Other Accounts     325
Deductions (91) (568) (218)
Balance at End of Period 286 206 731
Valuation allowance in net deferred tax assets      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 56,273 34,909 7,753
Charged (Credited) to Costs and Expenses 50,520 23,655 27,156
Charged to Other Accounts   (2,291)  
Balance at End of Period $ 106,793 $ 56,273 $ 34,909