Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Examination [Line Items]
Undistributed foreign earnings	$ 762,000
Net operating loss carryforwards	396,313	$ 429,458
Alternative minimum taxes	13,901	10,727
Unrecognized tax benefits that would affect the effective tax rate in future periods	48,000
Deferred income tax accrued interest and penalties	5,000	4,000
Income tax related to interest and penalties	1,000	1,000	$ 1,000
Decrease in unrecognized tax benefits related to federal, state and foreign tax positions	3,000
Total assets of variable interest entities	140,000	140,000
Total liabilities of variable interest entities	237,000	$ 237,000
Domestic Country
Income Tax Examination [Line Items]
Net operating loss carryforwards	359,000
Other Jurisdictions
Income Tax Examination [Line Items]
Net operating loss carryforwards	22,000
Foreign Country
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 15,000