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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 107,079 $ 56,479 $ 35,640
Charged (Credited) to Costs and Expenses (51,311) 50,691 23,698
Charged to Other Accounts 45,301   (2,291)
Deductions (115) (91) (568)
Balance at End of Period 100,954 107,079 56,479
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 286 206 731
Charged (Credited) to Costs and Expenses 99 171 43
Deductions (115) (91) (568)
Balance at End of Period 270 286 206
Valuation allowance in net deferred tax assets      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 106,793 56,273 34,909
Charged (Credited) to Costs and Expenses (51,410) 50,520 23,655
Charged to Other Accounts 45,301   (2,291)
Balance at End of Period $ 100,684 $ 106,793 $ 56,273