Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 7,437	$ 2,140	$ 13,624	$ 10,126
Operational Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1,300		2,300
Consolidation of Leased Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 6,200		$ 11,300