Income Taxes Deferred Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax effect of temporary differences [Line Items]
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	$ 53,108,000	$ 76,730,000
Deferred Tax Assets, Inventory	13,797,000	14,490,000
Deferred Tax Assets, Environmental	3,638,000	4,715,000
Deferred Tax Assets, Tax Credit Carryforwards	7,540,000	10,932,000
Deferred Tax Assets, Hedging Transactions	2,982,000	3,687,000
Deferred Tax Assets, Long term contracts	6,345,000	1,442,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	4,675,000	3,879,000
Deferred Tax Assets, Gross	92,085,000	115,875,000
Deferred Tax Liabilities, Property, Plant and Equipment	(17,741,000)	(14,237,000)
Deferred Tax Liabilities, Other Finite-Lived Assets	(28,798,000)	(27,469,000)
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs	(2,982,000)	(3,702,000)
Deferred Tax Liabilities, Other	(1,400,000)	(1,589,000)
Deferred Tax Liabilities, Net	(50,921,000)	(46,997,000)
Net deferred tax assets before valuation allowance	41,164,000	68,878,000
Deferred Tax Assets, Valuation allowance	(4,657,000)	(5,288,000)
Net deferred tax assets after valuation allowance	36,507,000	63,590,000
Net decrease in valuation allowance	600,000
U.S. foreign tax credit carryforwards	4,600,000
Pre-tax income (loss) from foreign operations	(200,000)	2,500,000	4,200,000
Undistributed earnings from foreign subsidiaries	$ 26,600,000