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Derivative Instruments (Interest Rate Caps) (Details) (Interest Rate Caps [Member], SunTrust [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional amount	$ 79,000invest_DerivativeNotionalAmount
Derivative assets	2,092	2,778
Interest Rate Caps, Maturity Date, July 7, 2021, 2.50% [Member]
Derivative [Line Items]
Notional amount	40,000
Cap rate	2.50%
Derivative assets	1,052	1,398
Interest Rate Caps, Maturity Date, July 8, 2021, 2.50% [Member]
Derivative [Line Items]
Notional amount	12,000
Cap rate	2.50%
Derivative assets	316	420
Interest Rate Caps, Maturity Date, July 29, 2021, 2.50% [Member]
Derivative [Line Items]
Notional amount	27,000
Cap rate	2.50%
Derivative assets	$ 724	$ 960