Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	$ 152,074	$ 123,646
Amortizable intangible assets, Accumulated Amortization	101,774	88,523
Amortizable intangible assets, Net Balance	50,300	35,123
Non-amortizable intangible assets
Total intangible assets, Gross Carrying Amount	190,751	161,254
Total intangible assets, Accumulated Amortization	103,892	90,641
Total intangible assets, Net Balance	86,859	70,613
Aggregate intangible amortization expense	15,300	13,700	17,500
Trade names
Non-amortizable intangible assets
Non-amortizable intangible assets, Gross Carrying Amount	38,677	37,608
Non-amortizable intangible assets, Accumulated Amortization	2,118	2,118
Non-amortizable intangible assets, Net Balance	36,559	35,490
Patents
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	12,941	12,106
Amortizable intangible assets, Accumulated Amortization	5,260	4,321
Amortizable intangible assets, Net Balance	7,681	7,785
Customer lists
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	35,742	30,083
Amortizable intangible assets, Accumulated Amortization	20,511	19,009
Amortizable intangible assets, Net Balance	15,231	11,074
Licenses
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	78,556	62,124
Amortizable intangible assets, Accumulated Amortization	56,706	46,381
Amortizable intangible assets, Net Balance	21,850	15,743
Intellectual property
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	23,335	17,833
Amortizable intangible assets, Accumulated Amortization	18,102	17,719
Amortizable intangible assets, Net Balance	5,233	114
Lottery contracts
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	1,500	1,500
Amortizable intangible assets, Accumulated Amortization	1,195	1,093
Amortizable intangible assets, Net Balance	$ 305	$ 407