Long-Term Debt Interest Rate Swaps (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Long-term Debt, Weighted Average Interest Rate	2.2124%	2.28%
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	2.46%
Interest Rate Derivative, April 2014, .54% [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	12,000,000
Derivative, Fixed Interest Rate on LIBOR Component	0.54%
Derivative, Effective Aggregate Interest Rate	2.54%
Interest Rate Derivative, April 2014, .47% [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	23,000,000
Derivative, Fixed Interest Rate on LIBOR Component	0.47%
Derivative, Effective Aggregate Interest Rate	2.47%
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	3.08%
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	2.73%
Interest Rate Derivative, September 2013, .625% [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	2.625%
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	3.05%