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Restructuring Charges (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jan. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Current	$ 3,500			$ 3,500
Restructuring charges	(1,022)		$ 0	$ 2,223	$ 0
Restructuring and Related Cost, Positions Eliminated [Abstract]
Restructuring and Related Cost, Number of Positions Eliminated				50
Restructuring Reserve [Roll Forward]
Restructuring charges	(1,022)		$ 0	$ 2,223	$ 0
2018 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	167	$ 3,245
Restructuring Reserve [Roll Forward]
Beginning balance	991	0		0
Restructuring charges	167	3,245
Payments for Restructuring	(352)	(1,584)
Restructuring Reserve, Settled without Cash	0	(670)
Ending balance	806	991		806
2018 Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(123)	2,357
Restructuring Reserve [Roll Forward]
Beginning balance	827	0		0
Restructuring charges	(123)	2,357
Payments for Restructuring	(270)	(1,530)
Restructuring Reserve, Settled without Cash	0	0
Ending balance	434	827		434
2018 Plan [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	164	0		0
Restructuring Costs and Asset Impairment Charges	290	888
Payments for Restructuring	(82)	(54)
Restructuring Reserve, Settled without Cash	0	(670)
Ending balance	$ 372	$ 164		372
2018 Plan [Member] | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges				2,000
Restructuring Reserve [Roll Forward]
Restructuring charges				2,000
2018 Plan [Member] | Corporate
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 [Member]
Restructuring Cost and Reserve [Line Items]
Company estimate of the aggregate restructuring cost						$ 5,000

X

- 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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