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Derivatives (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative [Line Items] |
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:
|  | 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 |
|  | December 31, 2014
|  | Derivative Assets |  | Derivative Liabilities
Trading Instruments |  | Fair Value |  | Notional |  | Fair Value |  | Notional
Interest rate swaps |  | $ | 5,727 |  |  | $ | 440,000 |  |  | $ | (3,002 | ) |  | $ | 485,000 |
Eurodollar futures (2) |  | — |  |  | — |  |  | (32,896 | ) |  | 16,600,000 |
Total |  | $ | 5,727 |  |  | $ | 440,000 |  |  | $ | (35,898 | ) |  | $ | 17,085,000 |
(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.
(2) | 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 December 31, 2014.
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 December 31, 2015:
Remaining Maturity |  | Pay-Fixed Interest Rate Swaps |  | Pay-Fixed Weighted-Average Rate |  | Receive-Fixed Interest Rate Swaps |  | Receive-Fixed Weighted-Average Rate
13-24 months |  | $ | 1,435,000 |  |  | 1.18 | % |  | $ | — |  |  | — | %
25-36 months |  | — |  |  | — | % |  | — |  |  | — | %
37-48 months |  | 160,000 |  |  | 1.37 | % |  | 250,000 |  |  | 1.91 | %
49-60 months |  | 685,000 |  |  | 1.71 | % |  | 50,000 |  |  | 1.75 | %
61-72 months |  | — |  |  | — | % |  | 100,000 |  |  | 1.69 | %
73-84 months |  | 75,000 |  |  | 1.77 | % |  | — |  |  | — | %
85-96 months |  | 125,000 |  |  | 1.98 | % |  | — |  |  | — | %
97-108 months |  | — |  |  | — | % |  | 25,000 |  |  | 2.71 | %
109-120 months |  | 475,000 |  |  | 2.86 | % |  | — |  |  | — | %
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 period indicated:
For the year ended December 31, 2015: | Beginning of Period Notional Amount |  | Additions |  | Settlement, Termination, Expiration or Exercise |  | End of Period Notional Amount
Receive-fixed interest rate swaps | $ | 275,000 |  |  | $ | 150,000 |  |  | $ | — |  |  | $ | 425,000 |
Pay-fixed interest rate swaps | 650,000 |  |  | 3,135,000 |  |  | (830,000 | ) |  | 2,955,000 |
Eurodollar futures | 16,600,000 |  |  | — |  |  | (10,300,000 | ) |  | 6,300,000 |
| $ | 17,525,000 |  |  | $ | 3,285,000 |  |  | $ | (11,130,000 | ) |  | $ | 9,680,000 |
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] | The table below provides detail of the Company's "loss on derivative instruments, net" by type of interest rate derivative for the periods indicated:
| Year Ended
| December 31,
Type of Derivative Instrument | 2015 |  | 2014 |  | 2013
Receive-fixed interest rate swaps | $ | 6,522 |  |  | $ | 4,912 |  |  | $ | — |
Pay-fixed interest rate swaps | (28,687 | ) |  | (30,754 | ) |  | 9,315 |
Eurodollar futures | (20,963 | ) |  | (27,551 | ) |  | (19,391 | )
Loss on derivative instruments, net | $ | (43,128 | ) |  | $ | (53,393 | ) |  | $ | (10,076 | )

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579240-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41620-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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