Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other intangible assets
Amortizable intangibles, gross carrying amount	$ 105,286	$ 105,286
Amortizable intangibles, accumulated amortization	48,738	43,539
Amortizable intangibles, net carrying amount	56,548	61,747
Gross Carrying Amount	165,286	165,286
Net Carrying Amount	116,548	121,747
Amortization expense for intangible assets	5,199	5,201	6,001
Estimated amortization expense for the next five years
2013	5,193
2014	5,193
2015	5,142
2016	4,883
2017	4,883
Other intangible assets, additional disclosure
Weighted average remaining life for intangible assets	11 years 3 months 18 days
Dealer network
Other intangible assets
Amortizable intangibles, gross carrying amount	80,000	80,000
Amortizable intangibles, accumulated amortization	35,000	31,000
Amortizable intangibles, net carrying amount	45,000	49,000
Customer relations
Other intangible assets
Amortizable intangibles, gross carrying amount	2,000	2,000
Amortizable intangibles, accumulated amortization	956	822
Amortizable intangibles, net carrying amount	1,044	1,178
Patents
Other intangible assets
Amortizable intangibles, gross carrying amount	15,116	15,116
Amortizable intangibles, accumulated amortization	5,491	4,735
Amortizable intangibles, net carrying amount	9,625	10,381
Noncompete agreements
Other intangible assets
Amortizable intangibles, gross carrying amount	5,050	5,050
Amortizable intangibles, accumulated amortization	5,050	5,050
Other intangible assets, additional disclosure
Weighted average remaining life for intangible assets	5 years
Trademark-Blizzard
Other intangible assets
Amortizable intangibles, gross carrying amount	3,100	3,100
Amortizable intangibles, accumulated amortization	2,221	1,912
Amortizable intangibles, net carrying amount	879	1,188
License
Other intangible assets
Amortizable intangibles, gross carrying amount	20	20
Amortizable intangibles, accumulated amortization	20	20
Trademark and tradenames
Other intangible assets
Indefinite-lived intangibles, net carrying amount	$ 60,000	$ 60,000