Annual report pursuant to Section 13 and 15(d)

Restructuring - (Narrative) (Details)

Restructuring - (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,583us-gaap_RestructuringCharges	$ 175us-gaap_RestructuringCharges	$ 73us-gaap_RestructuringCharges
Impairment of Long-Lived Assets to be Disposed of	2,056
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	813
Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 175

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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