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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 100,726 $ 105,030 $ 54,406
Charged (Credited) to Costs and Expenses 14,499 (49,490) 50,715
Charged to Other Accounts   45,301  
Deductions   (115) (91)
Balance at End of Period 115,225 100,726 105,030
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 270 286 206
Charged (Credited) to Costs and Expenses   99 171
Deductions   (115) (91)
Balance at End of Period 270 270 286
Valuation allowance in net deferred tax assets      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 100,456 104,744 54,200
Charged (Credited) to Costs and Expenses 14,499 (49,589) 50,544
Charged to Other Accounts   45,301  
Balance at End of Period $ 114,955 $ 100,456 $ 104,744