Property, Plant and Equiptment (Additional Information) (Details) (USD $)	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Depreciation				$ 22,700,000	$ 20,800,000	$ 14,600,000
Capital Lease Obligations Incurred					12,100,000
Capital lease obligation	8,400,000			8,400,000	9,200,000
Amortization of Leased Asset	400,000	100,000	300,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	$ 800,000			$ 800,000	$ 400,000