Derivatives (Tables)

9 Months Ended

Sep. 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 treated as trading instruments on its consolidated balance sheet as of the dates indicated:  

	September 30, 2014
	Derivative Assets				Derivative Liabilities
Trading Instruments	Fair Value		Notional		Fair Value			Notional
Interest rate swaps	$	6,958	$	800,000	$	(437	)	$	150,000
Eurodollar futures (1)	339		3,900,000		(17,621		)	12,700,000
Total	$	7,297	$	4,700,000	$	(18,058	)	$	12,850,000

	December 31, 2013
	Derivative Assets				Derivative Liabilities
Trading Instruments	Fair Value		Notional		Fair Value			Notional
Interest rate swaps	$	18,488	$	575,000	$	(1,336	)	$	215,000
Eurodollar futures (1)	—		—		(5,345		)	9,000,000
Total	$	18,488	$	575,000	$	(6,681	)	$	9,215,000

(1) The Eurodollar futures aggregate notional amount represents the total notional of the 3-month contracts with expiration dates from 2015 to 2020. The maximum notional outstanding for any future 3-month period did not exceed $1,300,000 as of September 30, 2014 and $1,175,000 as of December 31, 2013.

Schedule of Derivative Instruments [Table Text Block]

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

Remaining Maturity	Pay-Fixed Interest Rate Swaps		Pay-Fixed Weighted-Average Rate(1)		Receive Fixed Interest Rate Swaps		Receive-Fixed Weighted-Average Rate
37-48 months	$	185,000	0.92	%	$	—	—	%
49-60 months	235,000		1.45	%	250,000		1.91	%
61-72 months	25,000		1.61	%	—		—	%
73-84 months	50,000		2.20	%	—		—	%
85-96 months	—		—	%	—		—	%
97-108 months	30,000		1.93	%	—		—	%
109-120 months	150,000		2.17	%	25,000		2.71	%

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

The following table summarizes the volume of activity related to derivative instruments for the periods indicated:

For the nine months ended September 30, 2014:	Beginning of Period Notional Amount		Additions		Settlement, Termination, Expiration or Exercise			End of Period Notional Amount
Receive-fixed interest rate swaps	$	—	$	275,000	$	—		$	275,000
Pay-fixed interest rate swaps	790,000		75,000		(190,000		)	675,000
Eurodollar futures	9,000,000		7,600,000		—			16,600,000
	$	9,790,000	$	7,950,000	$	(190,000	)	$	17,550,000

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

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

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
Type of Derivative Instrument	2014		2013			2014			2013
Receive-fixed interest rate swaps	$	339	$	—		$	339		$	—
Pay-fixed interest rate swaps	646		(6,225		)	(20,056		)	5,111
Eurodollar futures	3,857		(17,794		)	(11,937		)	(17,794		)
Gain (loss) on derivative instruments, net	$	4,842	$	(24,019	)	$	(31,654	)	$	(12,683	)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

The table below describes the components of the reclassification adjustments out of AOCI related to certain interest rate swaps that were formerly designated as cash flow hedges and recognized as a portion of "interest expense" on the Company statements of comprehensive income for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2014		2013		2014		2013
Reclassification adjustment due to amortization of de-designated cash flow hedges	$	1,442	$	2,583	$	5,339	$	2,583
Reclassification adjustment due to recognition of interest expense from cash flow hedges	—		—		—		8,796
Total reclassification adjustment related to cash flow hedges	$	1,442	$	2,583	$	5,339	$	11,379