Income Taxes (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 8,027us-gaap_UnrecognizedTaxBenefits	$ 9,321us-gaap_UnrecognizedTaxBenefits	$ 6,965us-gaap_UnrecognizedTaxBenefits
Tax positions taken during prior periods	533	9,944	0
Tax positions taken during the current period	0	3,350	0
Acquisition	0	556	2,528
Settlements	0	(15,144)	(172)
Balance at December 31	8,560us-gaap_UnrecognizedTaxBenefits	8,027us-gaap_UnrecognizedTaxBenefits	9,321us-gaap_UnrecognizedTaxBenefits
Interest and penalties	0	9,614	0
The liability for unrecognized tax benefits included accrued interest	$ 1,031	$ 1,031	$ 0

The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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