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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
Credit loss reserves      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period $ 19,066 $ 15,622 $ 8,375
Charges to Earnings 78,229 64,278 47,242
Charges to Other Accounts (152) (46) (501)
Deductions (71,097) (60,788) (39,494)
Balance at End of Period 26,046 19,066 15,622
Revenue reserves      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 1,227 981 888
Charges to Earnings 103,627 111,069 86,901
Charges to Other Accounts 0 (2) (5)
Deductions (103,061) (110,821) (86,803)
Balance at End of Period 1,793 1,227 981
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 71,472 58,903 61,563
Charges to Earnings (235) 14,083 (599)
Charges to Other Accounts 5,839 (1,514) (2,061)
Deductions 0 0 0
Balance at End of Period 77,076 71,472 58,903
Other reserves      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 5,057 3,919 0
Balance at End of Period $ 7,495 $ 5,057 $ 3,919