Property and Equipment (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment
Capitalized Interest	$ 85,000	$ 54,000	$ 66,000
Unfunded ConstructionAnd Equipment Purchases	4,307,000
Depreciation Expense	$ 26,068,000	$ 25,279,000	$ 22,784,000