Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets
Deferred tax assets - current	$ 20,936	$ 18,290
Deferred tax liabilities - current	0	0
Deferred tax assets - non current	4,821	2,532
Deferred tax liabilities - non current	(14,689)	(15,703)
Total net deferred tax assets	11,068	5,119
Net operating losses	22,461	23,062
Accrued liabilities	18,879	13,060
Deferred compensation	8,604	7,666
Accrued compensation	5,736	6,433
Deferred revenue	5,523	0
Deferred rent	5,264	4,864
Tax credits	4,326	8,380
Equity awards	3,822	1,816
Other, net	309	8,060
Valuation allowance	(12,704)	(13,506)
Total deferred tax assets	62,220	59,835
Intangible assets	(43,699)	(45,955)
Depreciation	(7,453)	(8,761)
Total liabilities	$ 51,152	$ 54,716