Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Net operating loss carryforwards	$ 34,617	$ 35,227	[1]
Tax credits	10,845	6,534	[1]
Other deferred tax assets	8,880	12,613	[1]
Property and equipment	3,205	5,567	[1]
Long term investments	1,109	6,519	[1]
Other deferred tax assets	313	485	[1]
Total gross deferred tax assets	58,969	66,945	[1]
Deferred tax liabilities:
Intangible assets	12,323	11,757	[1]
Indefinite lived intangible assets	5,038	4,533	[1]
Total gross deferred tax liabilities	17,361	16,290	[1]
Total net deferred tax assets	41,608	50,655	[1]
Valuation allowance for deferred tax assets	(46,319)	(52,670)	[1]
Net deferred taxes	$ 4,711	$ 2,015	[1]

[1] Amounts for the year ended December 31, 2012 have been recast to conform to current year presentation.