Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
U.S. Federal tax rate	35.00%		35.00%
Income tax expense (benefit)	$ 7,668	$ 17,969	$ 382	$ 19,061
Effective tax rate	33.20%	35.70%	189.60%	34.40%
Tax benefit related to production activities	1.90%		174.70%
Foreign affiliate investment tax benefit, percent	1.70%