Fair Value Measurements (Summary of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Rate
Effective April 1, 2003 through April 1, 2013 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	$ 5,270
Fixed Interest Rate	4.54%
Effective July 11, 2010 through May 11, 2013 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	25,000
Fixed Interest Rate	1.42%
Effective October 3, 2011 through September 1, 2016 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	10,000
Fixed Interest Rate	1.33%
Effective March 1, 2013 through September 1, 2016 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	10,000
Fixed Interest Rate	1.62%
Effective March 1, 2013 through September 1, 2016, Exercisable on September 2, 2014 [Member] | Interest Rate Swaption [Member]
Derivative [Line Items]
Notional Amount	10,000
Fixed Interest Rate	2.00%
Effective June 1, 2013 through September 1, 2016 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	5,000
Fixed Interest Rate	1.70%
Effective June 1, 2013 through September 1, 2016, Exercisable on September 1, 2015 [Member] | Interest Rate Swaption [Member]
Derivative [Line Items]
Notional Amount	$ 5,000
Fixed Interest Rate	1.88%