Derivative Instruments and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013 Interest Rate Cap [Member]	Dec. 31, 2012 Interest Rate Swap [Member]	Sep. 30, 2013 Fair Value, Inputs, Level 1 [Member] Interest Rate Cap [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Interest Rate Swap [Member]	Sep. 30, 2013 Fair Value, Inputs, Level 2 [Member] Interest Rate Cap [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Interest Rate Swap [Member]	Sep. 30, 2013 Fair Value, Inputs, Level 3 [Member] Interest Rate Cap [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Interest Rate Swap [Member]
Other assets - Interest rate caps	$ 0		$ 0		$ 0		$ 0
Other liabilities - Interest rate swaps		$ (73)		$ 0		$ (73)		$ 0