Income Taxes (Provision for (Benefit From) Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal	$ (413)us-gaap_CurrentFederalTaxExpenseBenefit	$ 146us-gaap_CurrentFederalTaxExpenseBenefit	$ 102us-gaap_CurrentFederalTaxExpenseBenefit
State	2,164	1,677	1,834
Foreign	877us-gaap_CurrentForeignTaxExpenseBenefit	572us-gaap_CurrentForeignTaxExpenseBenefit	661us-gaap_CurrentForeignTaxExpenseBenefit
Total income taxes, current	2,628us-gaap_CurrentIncomeTaxExpenseBenefit	2,395us-gaap_CurrentIncomeTaxExpenseBenefit	2,597us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	14,110	9,168	5,951
State	495	1,041	981
Foreign	(225)	(443)	108
Total income taxes, deferred	14,380us-gaap_DeferredIncomeTaxExpenseBenefit	9,766us-gaap_DeferredIncomeTaxExpenseBenefit	7,040us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax provision	$ 17,008us-gaap_IncomeTaxExpenseBenefit	$ 12,161us-gaap_IncomeTaxExpenseBenefit	$ 9,637us-gaap_IncomeTaxExpenseBenefit

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