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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 130,655 $ 115,225 $ 100,726
Charged (Credited) to Costs and Expenses 653 15,490 14,499
Deductions (12,129) (60)  
Balance at End of Period 119,179 130,655 115,225
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 602 270 270
Charged (Credited) to Costs and Expenses 140 392  
Deductions (6) (60)  
Balance at End of Period 736 602 270
Valuation allowance in net deferred tax assets      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 130,053 114,955 100,456
Charged (Credited) to Costs and Expenses 513 15,098 14,499
Deductions (12,123)    
Balance at End of Period $ 118,443 $ 130,053 $ 114,955