Income Taxes Net Deferred Tax Assets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets [Line Items]
Property, equipment and intangible assets	$ (10,153,000)	$ (8,553,000)
Accrued compensation	15,696,000	14,693,000
Accrued expenses	12,718,000	5,491,000
Other	921,000	807,000
Foreign net operating losses	1,441,000	1,259,000
Capital loss carryovers	241,000	484,000
Deferred tax asset on unrecognized tax positions	1,736,000	2,226,000
Net deferred tax assets	21,535,000	15,334,000
Foreign Operations [Member]
Deferred Tax Assets [Line Items]
Other	603,000	186,000
Foreign Operations [Member] | Valuation Allowance, Other Tax Carryforward [Member]
Deferred Tax Assets [Line Items]
Valuation allowance, foreign	(227,000)	0
Foreign Operations [Member] | Valuation Allowance, Operating Loss Carryforwards [Member]
Deferred Tax Assets [Line Items]
Valuation allowance, foreign	$ (1,441,000)	$ (1,259,000)