Derivatives Interest Rate Swap (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Oct. 25, 2010
Derivative Instruments, Gain (Loss) [Line Items]
First Portion Variable-Rate Debt Outstanding		$ 55,000,000
Notional Amount of Interest Rate Cash Flow Hedge Derivatives			55,000,000
Derivative, Fixed Interest Rate	2.73%
Interest Rate Cash Flow Hedge Asset at Fair Value		1,159,000
Accumulated Other Comprehensive Income Loss Tax On Interest Rate Swap	451,000	451,000
Derivative, Cash Received on Hedge	28,000
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness	$ 73,000	$ 20,000