Derivative Financial Instruments (Details 3) (Derivatives in Cash Flow Hedging Relationship, USD $)
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6 Months Ended | ||||||||||
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Jun. 30, 2013
Interest rate cap
Credit facility
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Jun. 30, 2013
Zero premium interest rate collar
Credit facility
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Jun. 30, 2013
Interest rate swap
Revolving credit facility
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Jun. 30, 2013
Derivatives Designated as Hedging Instruments
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Dec. 31, 2012
Derivatives Designated as Hedging Instruments
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Jun. 30, 2013
Derivatives Designated as Hedging Instruments
Interest rate cap
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Dec. 31, 2012
Derivatives Designated as Hedging Instruments
Interest rate cap
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Jun. 30, 2013
Derivatives Designated as Hedging Instruments
Zero premium interest rate collar
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Dec. 31, 2012
Derivatives Designated as Hedging Instruments
Zero premium interest rate collar
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Jun. 30, 2013
Derivatives Designated as Hedging Instruments
Interest rate swap
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Dec. 31, 2012
Derivatives Designated as Hedging Instruments
Interest rate swap
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Fair values of derivative financial instruments | |||||||||||
Hedged borrowings | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | ||||||||
Borrowings variable interest rate | one-month LIBOR | one-month LIBOR | one-month LIBOR | ||||||||
Fixed rate (as a percent) | 3.93% | ||||||||||
Maximum cap rate (as a percent) | 5.50% | ||||||||||
Asset Derivatives | 92,000 | 35,000 | |||||||||
Liability Derivatives | $ 9,937,000 | $ 13,402,000 | $ 642,000 | $ 1,868,000 | $ 9,295,000 | $ 11,534,000 |