Income Taxes (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 10,634	$ 8,560	$ 8,027
Tax positions taken during prior periods	0	1,691	533
Tax positions taken during the current period	117	0	0
Acquisition	2,569	598	0
Lapse of the applicable statute of limitations	0	(215)	0
Balance at December 31	13,320	10,634	8,560
Interest and penalties	(337)	616	0
The liability for unrecognized tax benefits included accrued interest	$ 1,838	$ 1,923	$ 1,031