Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Total intangible assets amortization expenses	$ 32,000,000	$ 28,000,000	$ 25,000,000
Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Capitalized software development costs	15,600,000	12,200,000	12,600,000
Capitalized computer software amortization	14,000,000	14,100,000	13,400,000
Costs related to stock based compensation	$ 742,000	$ 519,000	$ 539,000
Useful life (in years)	3 years
Minimum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	3 years
Minimum [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	10 years
Maximum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	8 years
Maximum [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	17 years
Weighted Average [Member] | Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	1 year 9 months 18 days
Weighted Average [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	2 years 1 month 6 days
Weighted Average [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	4 years
Weighted Average [Member] | Other [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	2 years 3 months 18 days