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Schedule II - Valuation and Other Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance [Roll Forward]      
Valuation allowance, beginning balance $ 61,225 $ 68,595 $ 82,550
Valuation allowance charged to provision for income taxes (6,363) (5,473) 1,363
Valuation allowance amounts charged to other accounts 7,236 (1,897) (15,318)
Valuation allowance, ending balance $ 62,098 $ 61,225 $ 68,595