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Derivatives (Tables)
 9 Months Ended
Sep. 30, 2013
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:  
 
 
 
 
 
 
September 30, 2013
Type of Derivative Instrument
 
Accounting Designation
 
Balance Sheet Location:
 
Fair Value
 
Aggregate Notional Amount
Interest rate swaps
 
Non-hedging
 
Derivative assets
 
$
12,908

 
$
425,000

 
 
 
 
 
 
 
 
 
Interest rate swaps
 
Non-hedging
 
 
 
$
(20,837
)
 
$
1,267,000

Eurodollar futures
 
Non-hedging
 
 
 
—

 
20,250,000

 
 
 
 
Derivative liabilities
 
$
(20,837
)
 
$
21,517,000

 
 
 
 
 
 
December 31, 2012
Type of Derivative Instrument
 
Accounting Designation
 
Balance Sheet Location:
 
Fair Value
 
Aggregate Notional Amount
Interest rate swaps
 
Hedging
 
 
 
$
(39,813
)
 
$
1,435,000

Interest rate swaps
 
Non-hedging
 
 
 
(2,724
)
 
27,000

 
 
 
 
Derivative liabilities
 
$
(42,537
)
 
$
1,462,000


(1) Margin requirements from fluctuations in fair value of the Company's Eurodollar futures are settled daily with counterparties.
Description of Derivative Activity Volume Information related to the volume of activity for our interest rate derivative instruments subsequent to December 31, 2012 is as follows:(amounts in thousands)Interest Rate Swaps Eurodollar FuturesNotional amount as of December 31, 2012:$1,462,000 $—Additions:380,000 22,100,000Settlements, terminations, or expirations:(150,000) (1,850,000)Notional amount as of September 30, 2013:(1)$1,692,000 $20,250,000(1)The Eurodollar futures notional amount as of September 30, 2013 represents the total notional of the 3-month contracts with expiration dates from 2013 to 2020. The maximum notional outstanding for any 3-month period does not exceed $1,275,000.
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 September 30, 2013:
Remaining
Maturity
 
Notional Amount:
Trading
 
Weighted-Average
Fixed Rate Swapped
0-12 months
 
$
435,000

 
1.26
%
13-24 months
 
130,000

 
2.06
%
25-36 months
 
260,000

 
1.96
%
37-48 months
 
212,000

 
0.01
%
49-60 months
 
15,000

 
2.17
%
61-72 months
 
385,000

 
1.58
%
73-84 months
 
25,000

 
1.61
%
109-127 months
 
230,000

 
2.27
%
 
 
$
1,692,000

 
1.64
%
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
The tables below summarize the effect of the Company's interest rate derivatives reported in "(loss) gain on derivative instruments, net" on the Company's consolidated statements of income for the periods indicated:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
Type of Derivative Instrument
 
2013
 
2012
 
2013
 
2012
Interest rate swaps
 
$
(6,225
)
 
$
(333
)
 
$
5,111

 
$
(907
)
Eurodollar futures
 
(17,794
)
 
—

 
(17,794
)
 
—

Loss on derivative instruments, net
 
$
(24,019
)
 
$
(333
)
 
$
(12,683
)
 
$
(907
)