Income Taxes (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (decrease) in unrecognized tax benefits due to:
Balance at January 1	$ 9,209	$ 13,320	$ 10,634
Tax positions taken during prior periods	649	1,141	0
Tax positions taken during the current period	367	778	117
Acquisition	2,516	0	2,569
Settlements	0	(4,162)	0
Lapse of the applicable statute of limitations	(1,290)	(1,868)	0
Foreign Currency Translation	143	0	0
Balance at December 31	11,594	9,209	13,320
Interest and penalties	370	(257)	(337)
The liability for unrecognized tax benefits included accrued interest	$ 4,169	$ 1,576	$ 1,838