Summary Of Goodwill & Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	$ 160,036		$ 137,850
Accumulated Amortization, Finite-Lived Intangible Assets	(74,664)		(65,633)
Net Carrying Amount, Finite-Lived Intangible Assets	85,372		72,217
Indefinite lived intangible assets	375		97
Goodwill	2,479		2,508
Gross Carrying Amount, Total Intangible Assets	162,890		140,455
Net Carrying Amount, Total Intangible Assets	88,226		74,822
Capitalized Software [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	141,497	[1]	118,940	[1]
Accumulated Amortization, Finite-Lived Intangible Assets	(58,258)	[2]	(49,665)	[2]
Net Carrying Amount, Finite-Lived Intangible Assets	83,239		69,275
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	6,828		6,878
Accumulated Amortization, Finite-Lived Intangible Assets	(6,563)		(6,439)
Net Carrying Amount, Finite-Lived Intangible Assets	265		439
Patents, copyrights and trademarks [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	6,466		6,501
Accumulated Amortization, Finite-Lived Intangible Assets	(4,668)		(4,272)
Net Carrying Amount, Finite-Lived Intangible Assets	1,798		2,229
Core technology [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	4,539		4,548
Accumulated Amortization, Finite-Lived Intangible Assets	(4,539)		(4,548)
Other [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	706		983
Accumulated Amortization, Finite-Lived Intangible Assets	(636)		(709)
Net Carrying Amount, Finite-Lived Intangible Assets	$ 70		$ 274

[1] Includes $4.1 million of software held under a capital lease classified as capitalized software as of June 30, 2014 and December 31, 2013.

[2] Includes $2.2 million and $1.9 million of accumulated amortization of software held under a capital lease as of June 30, 2014 and December 31, 2013, respectively, which is amortized using the straight-line method over the useful life.