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Derivatives (Tables)
 9 Months Ended
Sep. 30, 2016
Derivative [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
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, 2016
 
 
Derivative Assets
 
Derivative Liabilities
Trading Instruments
 
Fair Value
 
Notional
 
Fair Value
 
Notional
Interest rate swaps
 
$
12,985

 
$
425,000

 
$
(41,385
)
 
$
1,355,000

Eurodollar futures (1)
 
—

 
—

 
(42,638
)
 
6,300,000

Total
 
$
12,985

 
$
425,000

 
$
(84,023
)
 
$
7,655,000



 
 
December 31, 2015
 
 
Derivative Assets
 
Derivative Liabilities
Trading Instruments
 
Fair Value
 
Notional
 
Fair Value
 
Notional
Interest rate swaps
 
$
7,835

 
$
460,000

 
$
(12,108
)
 
$
2,920,000

Eurodollar futures (1)
 
—

 
—

 
(29,097
)
 
6,300,000

Total
 
$
7,835

 
$
460,000

 
$
(41,205
)
 
$
9,220,000

(1)
The Eurodollar futures aggregate notional amount represents the total notional of the 3-month contracts with expiration dates from 2017 to 2020. The maximum notional outstanding for any future 3-month period did not exceed $725,000 as of September 30, 2016 or as of December 31, 2015.
Schedule of Notional Amounts of Outstanding Derivative Positions
The following table summarizes the volume of activity related to derivative instruments for the period indicated:
For the nine months ended September 30, 2016:
Beginning of Period Notional Amount
 
Additions
 
Settlement, Termination, Expiration or Exercise
 
End of Period Notional Amount
Receive-fixed interest rate swaps
$
425,000

 
$
—

 
$
—

 
$
425,000

Pay-fixed interest rate swaps (1)
2,955,000

 
1,250,000

 
(2,850,000
)
 
1,355,000

Eurodollar futures
6,300,000

 
—

 
—

 
6,300,000

 
$
9,680,000

 
$
1,250,000

 
$
(2,850,000
)
 
$
8,080,000
Derivative Instruments, Gain (Loss) [Table Text Block]
The table below provides detail of the Company's "(loss) gain on derivative instruments, net" by type of derivative for the periods indicated:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
Type of Derivative Instrument
2016
 
2015
 
2016
 
2015
Receive-fixed interest rate swaps
$
(2,976
)
 
$
6,975

 
$
11,301

 
$
9,757

Pay-fixed interest rate swaps
2,555

 
(48,697
)
 
(59,912
)
 
(45,797
)
Eurodollar futures
2,830

 
(11,027
)
 
(13,542
)
 
(24,942
)
(Loss) gain on derivative instruments, net
$
2,409

 
$
(52,749
)
 
$
(62,153
)
 
$
(60,982
)