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Derivatives (Tables) | 6 Months Ended
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Jun. 30, 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:
|  | June 30, 2015
|  | Derivative Assets |  | Derivative Liabilities
Trading Instruments |  | Fair Value |  | Notional |  | Fair Value |  | Notional
Interest rate swaps |  | $ | 20,804 |  |  | $ | 1,305,000 |  |  | $ | (4,249 | ) |  | $ | 885,000 |
Eurodollar futures (1) |  | — |  |  | — |  |  | (43,991 | ) |  | 14,000,000 |
Total |  | $ | 20,804 |  |  | $ | 1,305,000 |  |  | $ | (48,240 | ) |  | $ | 14,885,000 |
|  | 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 (1) |  | — |  |  | — |  |  | (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 2015 to 2020. The maximum notional outstanding for any future 3-month period did not exceed $1,300,000 as of June 30, 2015 or 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 June 30, 2015:
Remaining Maturity |  | Pay-Fixed Interest Rate Swaps |  | Pay-Fixed Weighted-Average Rate |  | Receive-Fixed Interest Rate Swaps |  | Receive-Fixed Weighted-Average Rate
37-48 months |  | $ | 345,000 |  |  | 1.13 | % |  | $ | — |  |  | — | %
49-60 months |  | 835,000 |  |  | 1.77 | % |  | 300,000 |  |  | 1.24 | %
61-72 months |  | — |  |  | — | % |  | — |  |  | — | %
73-84 months |  | 75,000 |  |  | 1.77 | % |  | — |  |  | — | %
85-96 months |  | 125,000 |  |  | 1.98 | % |  | — |  |  | — | %
97-108 months |  | — |  |  | — | % |  | — |  |  | — | %
109-120 months |  | 485,000 |  |  | 2.96 | % |  | 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 period indicated:
For the six months ended June 30, 2015: | Beginning of Period Notional Amount |  | Additions |  | Settlement, Termination, Expiration or Exercise |  | End of Period Notional Amount
Receive-fixed interest rate swaps | $ | 275,000 |  |  | $ | 50,000 |  |  | $ | — |  |  | $ | 325,000 |
Pay-fixed interest rate swaps | 650,000 |  |  | 1,735,000 |  |  | (520,000 | ) |  | 1,865,000 |
Eurodollar futures | 16,600,000 |  |  | — |  |  | (2,600,000 | ) |  | 14,000,000 |
| $ | 17,525,000 |  |  | $ | 1,785,000 |  |  | $ | (3,120,000 | ) |  | $ | 16,190,000 |
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 |  | Six Months Ended
|  | June 30, |  | June 30,
Type of Derivative Instrument |  | 2015 |  | 2014 |  | 2015 |  | 2014
Receive-fixed interest rate swaps |  | $ | (1,746 | ) |  | $ | — |  |  | $ | 2,782 |  |  | $ | — |
Pay-fixed interest rate swaps |  | 16,263 |  |  | (11,694 | ) |  | 2,900 |  |  | (20,702 | )
Eurodollar futures |  | 2,573 |  |  | (11,380 | ) |  | (13,915 | ) |  | (15,794 | )
Gain (loss) on derivative instruments, net |  | $ | 17,090 |  |  | $ | (23,074 | ) |  | $ | (8,233 | ) |  | $ | (36,496 | )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |

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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=35706170&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=35706170&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=35706170&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=35706170&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=35706170&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=35706170&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=35706170&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=35706170&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=35706170&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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