Goodwill & Intangible Assets (Summary Of Goodwill & Intangible Assets) (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets		$ 182,707	$ 175,130
Accumulated Amortization, Finite-Lived Intangible Assets		(95,587)	(78,126)
Net Carrying Amount, Finite-Lived Intangible Assets		87,120	97,004
Indefinite lived intangible assets	[1]	300	333
Goodwill	[1]	2,030	2,044
Gross Carrying Amount, Total Intangible Assets		185,037	177,507
Net Carrying Amount, Total Intangible Assets		89,450	99,381
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	[2]	166,774	157,615
Accumulated Amortization, Finite-Lived Intangible Assets	[3]	(81,406)	(62,591)
Net Carrying Amount, Finite-Lived Intangible Assets		85,368	95,024
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets		4,846	5,945
Accumulated Amortization, Finite-Lived Intangible Assets		(4,846)	(5,798)
Net Carrying Amount, Finite-Lived Intangible Assets			147
Patents, Copyrights And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets		6,674	6,702
Accumulated Amortization, Finite-Lived Intangible Assets		(5,054)	(4,931)
Net Carrying Amount, Finite-Lived Intangible Assets		1,620	1,771
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets		4,170	4,170
Accumulated Amortization, Finite-Lived Intangible Assets		(4,170)	(4,170)
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets		243	698
Accumulated Amortization, Finite-Lived Intangible Assets		(111)	(636)
Net Carrying Amount, Finite-Lived Intangible Assets		$ 132	$ 62

[1] Change in goodwill and indefinite lived intangible assets relate entirely to foreign currency translation.

[2] Includes $4.1 million of software held under a capital lease classified as capitalized software as of both September 30, 2015, and December 31, 2014.

[3] Includes $2.9 million and $2.5 million of accumulated amortization of software held under a capital lease as of September 30, 2015, and December 31, 2014, respectively, and is amortized using the straight-line method over the useful life.