Pensions (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Percentage of equity securities in portfolio	25.00%
Percentage of debt securities in portfolio	74.00%
Percentage of other investments in portfolio	1.00%
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 101,500,000	$ 90,300,000
Percentage of investments in equity securities	65.00%
Percentage of investments in debt securities	35.00%
Percentage of return on asset portfolio	1.20%	22.40%
Non-current portion of liabilities included in accrued pension and other liabilities	23,075,000	11,834,000
Maximum percentage of employee contribution in defined contribution plan	50.00%
Fixed contribution of eligible employee compensation by company	3.00%
Specified matching contribution by each participant	50.00%
Maximum percentage of employee contribution of employee compensation	1.00%
Maximum percentage of additional discretion company contribution under defined contribution plan	4.00%
European Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	32,700,000	34,000,000
Non-current portion of liabilities included in accrued pension and other liabilities	8,518,000	11,388,000
U.S. And European Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-current portion of liabilities included in accrued pension and other liabilities	31,600,000	23,200,000
Defined Contribution Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions per actual hour worked for eligible employees	1.15
Total expenses related to the defined contribution plans	1,800,000	1,800,000	1,800,000
Kentucky Facility [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum contribution by company for each bargaining unit employee per month	25.00
Ohio Facility [Member] | 401 (k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions per actual hour worked for eligible employees	1.15
Pennsylvania Facility [Member] | Thrift Savings Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions per actual hour worked for eligible employees	1.65
Minimum [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of return on asset portfolio	6.70%
Investment period (in years) of assets	15
Maximum [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of return on asset portfolio	8.80%
Investment period (in years) of assets	25
Converted To Enhanced Defined Contribution Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional lump sum contributions employees that voluntarily convert to enhanced defined contribution per year	$ 5,000
Employer Fixed And Discretionary Contributions [Member] | Defined Contribution Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service period of employer fixed and discretionary contributions	2