Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	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]
Unrecognized Tax Benefits, Beginning Balance	$ 15,986,000us-gaap_UnrecognizedTaxBenefits	$ 12,555,000us-gaap_UnrecognizedTaxBenefits	$ 10,593,000us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year	3,873,000	4,546,000	3,731,000
Additions for tax positions of prior years	19,000	366,000	269,000
Reductions for tax positions of prior years	(954,000)	(46,000)	(446,000)
Lapse of statute of limitations	(1,394,000)	(1,435,000)	(1,592,000)
Unrecognized Tax Benefits, Ending Balance	17,530,000us-gaap_UnrecognizedTaxBenefits	15,986,000us-gaap_UnrecognizedTaxBenefits	12,555,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate	7,600,000
Income tax interest expense (income) (net of tax benefit) and penalties expense (income)	27,000	15,000	25,000
Accrued interest (net of tax benefit) and penalties payments	$ 200,000	$ 200,000

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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-Publisher FASB

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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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 increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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