Restructuring And Impairment Costs (Cumulative Restructuring And Impairment Costs) (Details) (USD $) In Thousands	3 Months Ended				15 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011
Employee termination benefits					$ 14,917
Pension curtailment and settlement costs					4,081
Other costs					3,733
Total restructuring cost					22,731
Impairment costs - Property, plant and equipment					5,632
Total restructuring and impairment costs	6,859	[1]	949	[1]	28,363
Closure Of Processing Facility In Canada [Member]
Employee termination benefits					2,412
Pension curtailment and settlement costs					4,081
Other costs
Total restructuring cost					6,493
Impairment costs - Property, plant and equipment					5,632
Total restructuring and impairment costs					12,125
Other Restructuring and Cost Reduction Initiatives [Member]
Employee termination benefits					12,505
Pension curtailment and settlement costs					0
Other costs					3,733
Total restructuring cost					16,238
Impairment costs - Property, plant and equipment
Total restructuring and impairment costs					$ 16,238

[1] Item is not included in segment operating income, but is included in consolidated operating income.