Financial Derivative Instruments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Interest-Rate Swap Agreement [Line Items]
Fair value of derivatives, net liability	$ 0	$ 2,432,000
Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Interest-Rate Swap Agreement [Line Items]
Fair value of derivatives, net liability	1,426,000	0
Interest Rate Swap September 2011 - September 2014 [Member] | Interest Rate Swap Agreement [Member]
Interest-Rate Swap Agreement [Line Items]
Variable Interest Rate (in hundredths)	1.66%
Interest Rate Swap September 2011 - September 2014 [Member] | Interest Rate Swap Agreement [Member] | Cash Flow Hedging [Member]
Interest-Rate Swap Agreement [Line Items]
Coverage Amount	24,000,000
Interest Rate Swap September 2011 - March 2015 [Member] | Interest Rate Swap Agreement [Member]
Interest-Rate Swap Agreement [Line Items]
Variable Interest Rate (in hundredths)	1.91%
Interest Rate Swap September 2011 - March 2015 [Member] | Interest Rate Swap Agreement [Member] | Cash Flow Hedging [Member]
Interest-Rate Swap Agreement [Line Items]
Coverage Amount	24,000,000
Interest Rate Swap September 2011 - September 2015 [Member] | Interest Rate Swap Agreement [Member]
Interest-Rate Swap Agreement [Line Items]
Variable Interest Rate (in hundredths)	2.14%
Interest Rate Swap September 2011 - September 2015 [Member] | Interest Rate Swap Agreement [Member] | Cash Flow Hedging [Member]
Interest-Rate Swap Agreement [Line Items]
Coverage Amount	$ 24,000,000