Fair Value Measurements (Details Textual) (USD $)	Dec. 31, 2013
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of interest rate swaps	1
Total Return Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount of TRS borrowings subject to fair value adjustments	$ 358,755,000