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Commitments and Contingencies - Narratives (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Nov. 16, 2018 case	Dec. 31, 2018 USD ($) claim	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($)
Loss contingency
Accrued liability for the outcomes of non-income based tax audits		$ 4,500	$ 4,500	$ 1,700
Indemnification liability		$ 2,600	$ 2,600	1,600
Litigation and Claims
Number of cases appealed | claim		3	3
Loss Contingencies
Benefit from tax audit		$ 11,300
Tax refund receivable		15,262	$ 15,262	$ 0
Number of cases settled	2		3
Similar Judge
Loss Contingencies
Number of cases settled | claim			2
Accrued liabilities
Loss Contingencies
Accrued income taxes		4,000	$ 4,000
Cost of sales excluding depreciation and amortization
Loss Contingencies
Benefit from tax audit		1,800
SG&A
Loss Contingencies
Benefit from tax audit		8,900
Interest expense
Loss Contingencies
Benefit from tax audit		100
Other income
Loss Contingencies
Benefit from tax audit		$ 500

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