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Derivatives (Tables) | 6 Months Ended
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Jun. 30, 2014
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:
|  |  |  |  |  | June 30, 2014 |  | December 31, 2013
Type of Derivative Instrument |  | Accounting Designation |  | Balance Sheet Location: |  | Fair Value |  | Aggregate Notional Amount |  | Fair Value |  | Aggregate Notional Amount
Interest rate swaps |  | Non-hedging |  | Derivative assets |  | $ | 5,237 |  |  | $ | 290,000 |  |  | $ | 18,488 |  |  | $ | 575,000 |
Interest rate swaps |  | Non-hedging |  |  |  | $ | (2,835 | ) |  | $ | 410,000 |  |  | $ | (1,336 | ) |  | $ | 215,000 |
Eurodollar futures (1) |  | Non-hedging |  |  |  | (21,139 | ) |  | 11,400,000 |  |  | (5,345 | ) |  | 9,000,000 |
|  |  |  | Derivative liabilities |  | $ | (23,974 | ) |  | $ | 11,810,000 |  |  | $ | (6,681 | ) |  | $ | 9,215,000 |
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 June 30, 2014:
Remaining Maturity |  | Notional Amount |  | Weighted-Average Fixed Rate Swapped
37-48 months |  | 185,000 |  |  | 0.92 | %
49-60 months |  | 235,000 |  |  | 1.45 | %
61-72 months |  | 25,000 |  |  | 1.61 | %
73-84 months |  | 75,000 |  |  | 2.24 | %
85-108 months |  | 30,000 |  |  | 1.93 | %
109-127 months |  | 150,000 |  |  | 2.17 | %
|  | $ | 700,000 |  |  | 1.57 | %
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] | The table below provides detail of the Company's "(loss) gain 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 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Interest rate swaps |  | $ | (11,694 | ) |  | $ | 11,353 |  |  | $ | (20,702 | ) |  | $ | 11,336 |
Eurodollar futures |  | (11,380 | ) |  | — |  |  | (15,794 | ) |  | — |
(Loss) gain on derivative instruments, net |  | $ | (23,074 | ) |  | $ | 11,353 |  |  | $ | (36,496 | ) |  | $ | 11,336 |

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- Definition Tabular disclosure of gains and losses on derivative instruments included in an entity's trading activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 55 -Paragraph 184 -URI http://asc.fasb.org/extlink&oid=28362867&loc=SL5634876-113961 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624186-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: 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=7476318&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 + Details
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