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Derivatives (Tables)
 12 Months Ended
Dec. 31, 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:  
 
 
December 31, 2016
 
 
Derivative Assets
 
Derivative Liabilities
Trading Instruments
 
Fair Value
 
Notional
 
Fair Value
 
Notional
Interest rate swaps
 
$
28,534

 
$
2,670,000

 
$
(6,922
)
 
$
1,210,000

Eurodollar futures (1)
 
—

 
—

 
—

 
—

Total
 
$
28,534

 
$
2,670,000

 
$
(6,922
)
 
$
1,210,000



 
 
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 December 31, 2015.
Schedule of Notional Amounts of Outstanding Derivative Positions
The following table summarizes the notional activity related to derivative instruments for the period indicated:
For the year ended December 31, 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

 
3,500,000

 
(3,000,000
)
 
3,455,000

Eurodollar futures
6,300,000

 
—

 
(6,300,000
)
 
—

 
$
9,680,000

 
$
3,500,000

 
$
(9,300,000
)
 
$
3,880,000


(1) The notional amount of pay-fixed interest rate swaps that were forward starting as of December 31, 2016 was $2,725,000.

Derivative Instruments, Gain (Loss) [Table Text Block]
The table below provides detail of the Company's "loss on derivative instruments, net" by type of derivative for the periods indicated:
 
Year Ended
 
December 31,
Type of Derivative Instrument
2016
 
2015
 
2014
Receive-fixed interest rate swaps
$
2,515

 
$
6,522

 
$
4,912

Pay-fixed interest rate swaps
(3,306
)
 
(28,687
)
 
(30,754
)
Eurodollar futures
(4,815
)
 
(20,963
)
 
(27,551
)
Loss on derivative instruments, net
$
(5,606
)
 
$
(43,128
)
 
$
(53,393
)