Schedule II - Valuation and Qualifying Accounts (Details 1) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance, Beginning Balance	$ 14,401	$ 15,856	$ 18,873
Additions charged to income tax expense	759	1,043	1,049
Additions (reductions) charged to other comprehensive income	(17)	(59)	(30)
Reductions credited to income tax expense	(5,638)	(1,216)	(2,303)
Changes due to foreign currency translation	(133)	(2,204)	(1,733)
Acquisition	5,585	981
Allowance, Ending Balance	$ 14,957	$ 14,401	$ 15,856