Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings from continuing operations before income taxes [Abstract]
United States	$ 76,025,000	$ 50,278,000	$ 17,880,000
Foreign	29,444,000	17,167,000	15,132,000
Earnings from continuing operations before income tax provision	105,469,000	67,445,000	33,012,000
Income tax provision, current [Abstract]
U.S. federal and state income taxes, current	21,466,000	15,815,000	7,286,000
Foreign, current	8,465,000	6,663,000	4,793,000
Total current	29,931,000	22,478,000	12,079,000
Income tax provision, deferred [Abstract]
U.S. federal and state income taxes, deferred	9,820,000	2,819,000	(1,186,000)
Foreign, deferred	(253,000)	(1,383,000)	(360,000)
Total deferred	9,567,000	1,436,000	(1,546,000)
Total provision for taxes	39,498,000	23,914,000	10,533,000
Cash payments for income taxes [Abstract]
Cash payments for income taxes	30,500,000	18,800,000	22,000,000
Reconciliation of the income tax provision from statutory to GAAP [Abstract]
Tax provision computed at statutory rate	36,914,000	23,606,000	11,554,000
Tax effect of [Abstract]
Expenses for which no benefit was realized	1,569,000	279,000	335,000
Change in effective state tax rate	(6,000)	13,000	(44,000)
Tax credit	(817,000)	(1,065,000)	(962,000)
State taxes net of federal benefit	1,779,000	1,813,000	504,000
Benefit of manufacturing deduction	(1,492,000)	(1,127,000)	(481,000)
Acquisition costs	1,919,000
Other, net	(368,000)	395,000	(373,000)
Total provision for taxes	39,498,000	23,914,000	10,533,000
Deferred income tax assets [Abstract]
Pension costs	36,430,000	10,138,000
Payroll and benefits	1,365,000	1,313,000
Accrued warranty expenses	1,425,000	1,078,000
Postretirement benefits	8,143,000	6,356,000
Accrued liabilities	591,000	2,526,000
Other, net	1,680,000	758,000
Total deferred income tax assets, gross	49,634,000	22,169,000
Less valuation allowance	(1,117,000)	(389,000)
Total deferred income tax assets, net	48,517,000	21,780,000
Noncurrent deferred tax liabilities [Abstract]
Prepaid expenses	(993,000)	(644,000)
Depreciation	(34,143,000)	(21,004,000)
Inventories	(1,758,000)	(1,486,000)
Intangible assets	(8,784,000)	(2,099,000)
Other, net	(5,585,000)	(4,877,000)
Total noncurrent deferred income tax liabilities, net	(51,263,000)	(30,110,000)
Total net deferred tax liability	(2,746,000)	(8,330,000)
Current deferred tax asset [Abstract]
Continuing operations	1,140,000	3,554,000
Discontinued operations	0	69,000
Total current deferred tax asset	1,140,000	3,623,000
Noncurrent deferred tax liability [Abstract]
Continuing operations	(3,886,000)	(11,953,000)
Total noncurrent deferred tax liability	(3,886,000)	(11,953,000)
Total net deferred tax liability	(2,746,000)	(8,330,000)
Unrecognized tax benefits [Abstract]
Unrecognized tax benefits that would affect the net effective income tax rate in any future period	2,100,000	1,800,000	1,500,000
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance, beginning of period	1,838,000	1,509,000	1,368,000
Gross increases - current year tax positions	791,000	372,000	593,000
Gross increases - tax positions from prior periods	115,000	233,000	93,000
Gross decreases - tax positions from prior periods	(657,000)	(262,000)	(372,000)
Settlements	(27,000)	(14,000)	(173,000)
Balance, end of period	2,060,000	1,838,000	1,509,000
Interest and penalties accrued [Abstract]
Accrual for interest and penalties		160,500
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(45,000,000)	30,000,000	58,000,000
Tax credits and other various deductions [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated change in unrecognized tax benefits expected within the next twelve months	425,000
Undistributed Earnings of Foreign Subsidiaries that the Company Intends to Permanently Reinvest [Member]
Deferred Tax Liability Not Recognized [Line Items]
Cumulative amount on which no deferred U.S. income taxes have been provided	$ 88,500,000