Derivatives (Tables)

6 Months Ended

Jun. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The table below summarizes information about the Company’s derivative instruments on its consolidated balance sheet as of the dates indicated:  

			June 30, 2014					December 31, 2013
Type of Derivative Instrument	Accounting Designation	Balance Sheet Location:	Fair Value			Aggregate Notional Amount		Fair Value			Aggregate Notional Amount
Interest rate swaps	Non-hedging	Derivative assets	$	5,237		$	290,000	$	18,488		$	575,000
Interest rate swaps	Non-hedging		$	(2,835	)	$	410,000	$	(1,336	)	$	215,000
Eurodollar futures (1)	Non-hedging		(21,139		)	11,400,000		(5,345		)	9,000,000
		Derivative liabilities	$	(23,974	)	$	11,810,000	$	(6,681	)	$	9,215,000

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The following table summarizes the contractual maturities remaining for the Company’s outstanding interest rate swap agreements as of June 30, 2014:

Remaining Maturity	Notional Amount		Weighted-Average Fixed Rate Swapped
37-48 months	185,000		0.92	%
49-60 months	235,000		1.45	%
61-72 months	25,000		1.61	%
73-84 months	75,000		2.24	%
85-108 months	30,000		1.93	%
109-127 months	150,000		2.17	%
	$	700,000	1.57	%

Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]

The table below provides detail of the Company's "(loss) gain on derivative instruments, net" by type of interest rate derivative for the periods indicated:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Type of Derivative Instrument	2014			2013		2014			2013
Interest rate swaps	$	(11,694	)	$	11,353	$	(20,702	)	$	11,336
Eurodollar futures	(11,380		)	—		(15,794		)	—
(Loss) gain on derivative instruments, net	$	(23,074	)	$	11,353	$	(36,496	)	$	11,336