Schedule II - Valuation and Qualifying Accounts (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Reductions credited to income tax expense	$ (177)
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance, Beginning Balance	4,366	$ 10,223	$ 14,957
Additions charged to income tax expense	953	546	1,161
Additions (reductions) charged to other comprehensive income	(7)	(15)	(123)
Reductions credited to income tax expense	(1,683)	(6,064)	(6,773)
Changes due to foreign currency translation	(37)	(324)	1,001
Allowance, Ending Balance	$ 3,592	$ 4,366	$ 10,223