Long-Term Debt Interest Rate Swaps (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Long-term Debt, Weighted Average Interest Rate	2.54%	3.29%
Interest Rate Derivative, September 2013, .0625% [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	18,000,000
Derivative, Fixed Interest Rate on LIBOR Component	0.625%
Derivative, Effective Aggregate Interest Rate	2.375%
Interest Rate Derivative, September 2013, .46% [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	22,000,000
Derivative, Fixed Interest Rate on LIBOR Component	0.46%
Derivative, Effective Aggregate Interest Rate	2.21%
Interest Rate Derivative, May 2013, 1.08% [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	20,000,000
Derivative, Fixed Interest Rate on LIBOR Component	1.08%
Derivative, Effective Aggregate Interest Rate	2.83%
Interest Rate Derivative, May 2013, .73% [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	25,000,000
Derivative, Fixed Interest Rate on LIBOR Component	0.73%
Derivative, Effective Aggregate Interest Rate	2.48%
Interest Rate Derivative, February 2013, 1.05% [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	15,000,000
Derivative, Fixed Interest Rate on LIBOR Component	1.05%
Derivative, Effective Aggregate Interest Rate	2.80%