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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
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance $ 760 $ 760 $ 586
Valuation Allowances and Reserves, Charged to Cost and Expense 223 0 887
Valuation Allowances and Reserves, Deductions [1] 0 0 (713)
Valuation Allowances and Reserves, Charged to Other Accounts (5) 0 0
Valuation Allowances and Reserves, Balance 978 760 760
Valuation Allowance of Deferred Tax Assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance 74,153 69,049 44,321
Valuation Allowances and Reserves, Charged to Cost and Expense 20,417 5,872 26,634
Valuation Allowances and Reserves, Deductions 0 0 0
Valuation Allowances and Reserves, Charged to Other Accounts [2] (339) (768) (1,906)
Valuation Allowances and Reserves, Balance $ 94,231 $ 74,153 $ 69,049
[1] Deductions column represents the reversal of additions previously charged to costs and expenses and uncollectible accounts written off, net of recoveries.
[2] Other column represents the cumulative translation adjustment impact on the allowance.