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Restructuring Charges (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2018 USD ($)	Jan. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Current				$ 3,500
Restructuring charges	$ 2,217	$ 0	$ 0
Restructuring and Related Cost, Positions Eliminated [Abstract]
Restructuring and Related Cost, Number of Positions Eliminated	50
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 2,217	0	$ 0
2018 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,442
Restructuring Reserve [Roll Forward]
Beginning balance	0
Restructuring charges	3,442
Payments for Restructuring	(2,453)
Restructuring Reserve, Settled without Cash	(670)
Ending balance	319	0
2018 Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,234
Restructuring Reserve [Roll Forward]
Beginning balance	0
Restructuring charges	2,234
Payments for Restructuring	(2,227)
Restructuring Reserve, Settled without Cash	0
Ending balance	7	0
2018 Plan [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	0
Restructuring Costs and Asset Impairment Charges	1,208
Payments for Restructuring	(226)
Restructuring Reserve, Settled without Cash	(670)
Ending balance	312	$ 0
2018 Plan [Member] | Other | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,000
Restructuring Reserve [Roll Forward]
Restructuring charges	2,000
2018 Plan [Member] | Corporate | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	200
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 200
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Company estimate of the aggregate restructuring cost					$ 2,000
Maximum
Restructuring Cost and Reserve [Line Items]
Company estimate of the aggregate restructuring cost					$ 5,000

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- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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