Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets:
Accrued expenses	$ 39,881	$ 44,254
Warranty accrual	18,386	24,305
Deferred compensation	18,659	17,365
Allowance for doubtful accounts	7,189	7,740
Inventory	11,610	13,534
Deferred revenue	14,669	15,422
Pension and postretirement benefits	54,990	35,285
Research and development credit	7,467	7,548
Foreign tax credit	38,863	42,416
Net operating loss carryforwards	86,918	98,798
Capital loss carryforwards	3,604	2,973
State deferred taxes	13,061	6,646
Other	5,779	7,515
Deferred Tax Assets, Gross	321,076	323,801
Valuation allowance	(66,988)	(105,175)
Net deferred tax assets	254,088	218,626
Deferred tax liabilities:
Property, plant and equipment	20,116	24,201
Goodwill	36,712	38,182
Finance lease receivables	3,655	8,395
Investment in partnership	18,372	18,377
Other	6,435	7,300
Net deferred tax liabilities	85,290	96,455
Net deferred tax asset	$ 168,798	$ 122,171