Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Balance as of the beginning of the year	$ 1,039	$ 656	$ 641
Increases related to prior year tax positions	348	0	0
Decreases related to prior year tax positions	0	(15)	(244)
Increases related to current year tax positions	283	398	259
Settlements	0	0	(244)
Lapse of statue	283	398	259
Lapse of statue	(76)	0
Balance as of the end of the year	$ 1,594	$ 1,039	$ 656