Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Examination [Line Items]
U.S. Federal tax rate		35.00%		35.00%
Income tax expense (benefit)		$ (1,505)	$ 10,251	$ 17,556	$ 49,837
Foreign affiliate investment tax benefit, percent				33.20%
Effective tax rate		61.30%	34.70%		34.50%
Income taxes paid, net of refunds				$ 4,500
Scenario, Forecast [Member]
Income Tax Examination [Line Items]
Income taxes paid, net of refunds	$ 21,000