Taxes (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	6.00%	10.00%
Uncertain tax positions	$ 42,635us-gaap_UnrecognizedTaxBenefits	$ 34,520us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			179,151
Unrecognized Tax Benefits, Interest on Income Taxes Expense	672	534
Income Tax Expense (Benefit)	$ 2,660us-gaap_IncomeTaxExpenseBenefit	$ 1,329us-gaap_IncomeTaxExpenseBenefit

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of interest expense for an underpayment of income taxes.

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