Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
U.S. Federal tax rate	35.00%		35.00%
Income tax expense (benefit)	$ 1,104	$ (1,505)	$ 1,486	$ 17,556
Effective tax rate	24.80%	61.30%	32.00%	33.20%
Discrete tax benefit related to prior years	5.80%
Tax benefit related to production activities, percent	3.40%		3.30%