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Derivative Financial Instruments - Recognized Gain (Loss) (Details) (Not Designated as Hedging Instrument, Interest Expense, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest Rate Swap
Derivative Instruments, Gain (Loss)
Interest expense related to derivative financial instruments and net change in fair value of derivative financial instruments	$ 8,922	$ (4,728)	$ 10,528	$ (5,206)
Interest Rate Cap
Derivative Instruments, Gain (Loss)
Interest expense related to derivative financial instruments and net change in fair value of derivative financial instruments	$ 0	$ (59)	$ 0	$ (89)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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