Schedule II - Valuation and Qualifying Accounts (Details 1) (Valuation Allowance of Deferred Tax Assets [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance, Beginning Balance	$ 18,873	$ 24,936	$ 16,681
Additions charged to income tax expense	1,049	473	2,154
Additions (reductions) charged to other comprehensive income	(30)	(547)	205
Reductions credited to income tax expense	(2,303)	(1,412)	(1,676)
Changes due to foreign currency translation	(1,733)	(849)	728
Divestiture		(3,728)
Acquisition			6,844
Allowance, Ending Balance	$ 15,856	$ 18,873	$ 24,936