Income Taxes (Deferred Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	$ 45,545us-gaap_DeferredTaxAssetsGross	$ 45,885us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities, gross	23,539us-gaap_DeferredTaxLiabilitiesOther	25,013us-gaap_DeferredTaxLiabilitiesOther
Valuation allowance	0	0
Deferred tax assets, net of valuation allowance	45,545us-gaap_DeferredTaxAssetsNet	45,885us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities, net	23,539us-gaap_DeferredTaxLiabilities	25,013us-gaap_DeferredTaxLiabilities
Depreciation and amortization
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	254	580
Deferred tax liabilities, gross	0	0
Share-based compensation
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	817	781
Deferred tax liabilities, gross	0	0
Accruals and prepaids
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	2,342	3,415
Deferred tax liabilities, gross	470	788
Bad Debts
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	600	394
Deferred tax liabilities, gross	0	0
Acquired intangible assets
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	0	0
Deferred tax liabilities, gross	23,069	24,225
Net operating loss carryforwards (NOL) [Member]
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	16,595	19,698
Deferred tax liabilities, gross	0	0
Tax credit carryforwards
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	24,937	21,017
Deferred tax liabilities, gross	$ 0	$ 0

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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