Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Examination [Line Items]
Deferred tax assets included in prepaid expenses and other current assets	$ 32,553,000	$ 37,431,000
Undistributed foreign earnings	658,000,000
Net operating loss carryforwards	377,740,000	322,380,000
Alternative minimum taxes	10,727,000	10,727,000
Unrecognized tax benefits that would affect the effective tax rate in future periods	47,000,000
Deferred income tax accrued interest and penalties	4,000,000	5,000,000
Income tax related to interest and penalties	(1,000,000)
Decrease in unrecognized tax benefits related to federal, state and foreign tax positions	4,000,000
Total assets of variable interest entities	205,000,000	205,000,000
Total liabilities of variable interest entities	246,000,000	246,000,000
Changes in restricted cash	3,396,000	(10,553,000)	19,204,000
Domestic Country [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards	334,000,000
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards	21,000,000
Foreign Country [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 23,000,000