Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Net current deferred income tax assets:
Accrued expenses and reserves	$ 12,429	$ 19,322
Stock-based compensation	3,929	4,354
Total current deferred income tax assets	16,358	23,676
Less: valuation allowance	(1,273)	(1,432)
Net current deferred income tax assets	15,085	22,244
Net non-current deferred income tax assets:
Client contracts and related intangibles	(952)	(8,229)
NOL carryforwards	11,505	15,482
Property and equipment	4,097	12,999
Deferred revenue	1,209	1,700
Facility abandonment	189	606
Other	678	44
Total non-current deferred income tax assets	16,726	22,602
Less: valuation allowance	(9,279)	(20,006)
Net non-current deferred income tax assets	7,447	2,596
Net non-current deferred income tax liabilities:
Purchased R&D		222
Software	88	269
Client contracts and related intangibles	(4,104)	393
Goodwill	(3,846)	(4,207)
NOL carryforwards	27,500	25,276
Property and equipment	(4,812)	(13,609)
Convertible debt securities	(35,116)	(37,415)
Deferred revenue	4,470	4,858
Contingent payments	836	836
Facility abandonment	1,892	1,413
Other	7	1,740
Total non-current deferred income tax liabilities	(13,085)	(20,224)
Less: valuation allowance	(7,189)	(1,450)
Net non-current deferred income tax liabilities	$ (20,274)	$ (21,674)