Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	$ 57,004	$ 53,385
Valuation allowance	(5,979)	(7,840)
Deferred tax assets, net of valuation allowance	51,025	45,545
Deferred tax liabilities, gross	26,952	23,539
Deferred tax liabilities, net	$ 26,952	23,539
Depreciation and amortization
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets		254
Deferred tax liabilities, gross	$ 91	0
Share-based compensation
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	$ 937	817
Deferred tax liabilities, gross		0
Accruals and prepaids
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	$ 1,186	2,342
Deferred tax liabilities, gross		470
Bad Debts
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	$ 961	600
Deferred tax liabilities, gross		0
Acquired intangible assets
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets		0
Deferred tax liabilities, gross	$ 26,861	23,069
Net operating loss carryforwards (NOL) [Member]
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	$ 23,085	24,435
Deferred tax liabilities, gross		0
Tax credit carryforwards
Operating Loss Carryforwards [Line Items]
Total deferred income tax assets	$ 30,835	24,937
Deferred tax liabilities, gross		0
Deferred Tax Asset [Domain]
Operating Loss Carryforwards [Line Items]
Deferred Income Tax Assets, Net		$ 2,114