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Schedule II - Valuation and Qualifying Account (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 4,777 $ 14,337 $ 2,528
Additions / Charged to Expense 348 346 10,374
Deductions (1,200) (9,725) (761)
Other 0 (181) 2,196
Balance at end of period 3,925 4,777 14,337
Allowance for excess and obsolete inventory      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 21,584 4,626 2,200
Additions / Charged to Expense 1,800 19,727 1,762
Deductions (760) (2,769) (1,855)
Other 0 0 2,519
Balance at end of period 22,624 21,584 4,626
Allowance for deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 60,524 5,442 2,798
Additions / Charged to Expense 24,448 56,207 2,644
Deductions 0 (1,125) 0
Other 0 0 0
Balance at end of period $ 84,972 $ 60,524 $ 5,442