Income Taxes (Details 5) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in unrecognized tax benefits
Balance at the beginning of the year	$ 6,228,000us-gaap_UnrecognizedTaxBenefits	$ 5,818,000us-gaap_UnrecognizedTaxBenefits	$ 4,748,000us-gaap_UnrecognizedTaxBenefits
Additions for tax positions related to current year	244,000	324,000	435,000
Additions for tax positions relating to prior years	199,000	477,000	742,000
Reductions for tax positions relating to prior years	(2,345,000)	(224,000)	(59,000)
Reductions due to the lapse of the applicable statute of limitations	(38,000)		(48,000)
Settlements	(12,000)	(167,000)
Balance at the end of the year	4,276,000us-gaap_UnrecognizedTaxBenefits	6,228,000us-gaap_UnrecognizedTaxBenefits	5,818,000us-gaap_UnrecognizedTaxBenefits
Amount of unrecognized tax benefits that would affect effective tax rate	4,300,000	6,200,000
Accrued interest and penalties related to unrecognized tax benefits	300,000	800,000
2010 IRS settlement
Change in unrecognized tax benefits
Settlements	$ 2,300,000

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

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