Intangible Assets and Goodwill (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	$ 151,239		$ 151,239		$ 123,646
Amortizable intangible assets, Accumulated Amortization	99,029		99,029		88,523
Amortizable intangible assets, Net Balance	52,210		52,210		35,123
Non-amortizable intangible assets
Total intangible assets, Gross Carrying Amount	189,939		189,939		161,254
Total intangible assets, Accumulated Amortization	101,147		101,147		90,641
Total intangible assets, Net Balance	88,792		88,792		70,613
Aggregate intangible amortization expense	3,800	3,400	11,300	10,900
Increase in goodwill resulting from acquisitions			4,700
Decrease in goodwill as a result of foreign currency translation			2,373
Patents
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	12,755		12,755		12,106
Amortizable intangible assets, Accumulated Amortization	5,024		5,024		4,321
Amortizable intangible assets, Net Balance	7,731		7,731		7,785
Customer lists
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	36,248		36,248		30,083
Amortizable intangible assets, Accumulated Amortization	19,684		19,684		19,009
Amortizable intangible assets, Net Balance	16,564		16,564		11,074
Licenses
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	77,340		77,340		62,124
Amortizable intangible assets, Accumulated Amortization	55,319		55,319		46,381
Amortizable intangible assets, Net Balance	22,021		22,021		15,743
Intellectual property
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	23,396		23,396		17,833
Amortizable intangible assets, Accumulated Amortization	17,832		17,832		17,719
Amortizable intangible assets, Net Balance	5,564		5,564		114
Lottery contracts
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amount	1,500		1,500		1,500
Amortizable intangible assets, Accumulated Amortization	1,170		1,170		1,093
Amortizable intangible assets, Net Balance	330		330		407
Trade name
Non-amortizable intangible assets
Non-amortizable intangible assets, Gross Carrying Amount	38,700		38,700		37,608
Non-amortizable intangible assets, Accumulated Amortization	2,118		2,118		2,118
Non-amortizable intangible assets, Net Balance	$ 36,582		$ 36,582		$ 35,490