Property, Plant and Equipment (Additional Disclosures) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Depreciation expense, inclusive of expense captured in cost of revenue	$ 9,500,000	$ 8,000,000	$ 11,300,000
Impairment charges	0	0	8,898,000
Net gain (loss) on disposal of assets	$ 1,009,000	$ 0	$ (2,104,000)