Goodwill, Purchased Intangibles, and Software Development Costs - Schedule of Purchased Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Acquired And Internally Developed Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Gross Value	$ 165,903	$ 165,903
Finite Lived Intangible Assets, Accumulated Amortization and Impairment	(155,056)	(152,756)
Finite Lived Intangible Assets, Net Value	10,847	13,147
Indefinite-lived trade name	918	918
Total intangible assets, Gross Value	166,821	166,821
Total intangible assets, Accumulated Amortization and Impairment	(155,056)	(152,756)
Total intangible assets, Net Value	11,765	14,065
Capitalized software development costs for products to be sold, Gross Value	13,836	12,993
Capitalized software development costs for products to be sold, Accumulated Amortization & Impairment	(6,019)	(5,002)
Capitalized software development costs for products to be sold, Net Value	7,817	7,991
Core and developed technology
Acquired And Internally Developed Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Gross Value	81,178	81,178
Finite Lived Intangible Assets, Accumulated Amortization and Impairment	(81,045)	(80,945)
Finite Lived Intangible Assets, Net Value	133	233
Customer and partner relationships
Acquired And Internally Developed Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Gross Value	79,525	79,525
Finite Lived Intangible Assets, Accumulated Amortization and Impairment	(68,811)	(66,742)
Finite Lived Intangible Assets, Net Value	10,714	12,783
Non-compete agreements
Acquired And Internally Developed Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Gross Value	1,800	1,800
Finite Lived Intangible Assets, Accumulated Amortization and Impairment	(1,800)	(1,700)
Finite Lived Intangible Assets, Net Value		100
Trade name
Acquired And Internally Developed Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Gross Value	3,400	3,400
Finite Lived Intangible Assets, Accumulated Amortization and Impairment	$ (3,400)	(3,369)
Finite Lived Intangible Assets, Net Value		$ 31