Income Taxes - Accounting for Uncertainty in Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2012
Income Taxes (Textual) [Abstract]
Liability for unrecognized tax benefits	$ 3,417	$ 3,713	$ 4,079	$ 3,372
Income tax related to accrued interest, net of federal benefit	200	200	300
Unrecognized tax benefits that would favorably impact the tax rate			4,100
Reduction in liability for unrecognized tax benefits	$ 400	$ 5,800
Maximum
Income Taxes (Textual) [Abstract]
Unrecognized tax benefits decrease amount over next twelve months			$ 2,400