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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
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Net increase (decrease) from foreign currency translation gains (losses) $ 10,200 $ (1,500) $ (2,300)
Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 206,394 216,468 238,703
Net Increase (Decrease) to Expense 5,749 (10,074) (7,727)
Acquisitions and Other 0 0 (14,508)
Balance at End of Year $ 212,143 206,394 216,468
Revision of Prior Period, Adjustment | Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year   $ 228,000  
Net Increase (Decrease) to Expense     3,800
Acquisitions and Other     14,500
Balance at End of Year     $ 228,000