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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 115,225 $ 100,726 $ 105,030
Charged (Credited) to Costs and Expenses 15,490 14,499 (49,490)
Charged to Other Accounts     45,301
Deductions (60)   (115)
Balance at End of Period 130,655 115,225 100,726
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 270 270 286
Charged (Credited) to Costs and Expenses 392   99
Deductions (60)   (115)
Balance at End of Period 602 270 270
Valuation allowance in net deferred tax assets      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 114,955 100,456 104,744
Charged (Credited) to Costs and Expenses 15,098 14,499 (49,589)
Charged to Other Accounts     45,301
Balance at End of Period $ 130,053 $ 114,955 $ 100,456