Schedule II - Valuation and Qualifying Accounts (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Reductions credited to income tax expense	$ (206)
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance, Beginning Balance	10,223	$ 14,957	$ 14,401
Additions charged to income tax expense	546	1,161	759
Additions (reductions) charged to other comprehensive income	(15)	(123)	(17)
Reductions credited to income tax expense	(6,064)	(6,773)	(5,638)
Changes due to foreign currency translation	(324)	1,001	(133)
Acquisition			5,585
Allowance, Ending Balance	$ 4,366	$ 10,223	$ 14,957