Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Interest Rate Derivative Assets, at Fair Value	$ 0	$ 0
Interest Rate Derivative Liabilities, at Fair Value	0	(73)
Interest Rate Cap One [Member]
Notional Amount of Interest Rate Derivatives	100,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Cap Interest Rate	2.50%
Maturity Date	Jan. 31, 2014
Interest Rate Derivative Assets, at Fair Value	0	0
Interest Rate Derivative Liabilities, at Fair Value	0	0
Interest Rate Cap Two [Member]
Notional Amount of Interest Rate Derivatives	18,762
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Cap Interest Rate	1.25%
Maturity Date	Apr. 30, 2013
Interest Rate Derivative Assets, at Fair Value	0	0
Interest Rate Derivative Liabilities, at Fair Value	0	0
Interest Rate Swap One [Member]
Notional Amount of Interest Rate Derivatives	18,762
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Cap Interest Rate	1.39%
Maturity Date	Apr. 30, 2013
Interest Rate Derivative Assets, at Fair Value	0	0
Interest Rate Derivative Liabilities, at Fair Value	$ 0	$ (73)