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Derivatives (Tables) | 12 Months Ended
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Dec. 31, 2013
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:
|  |  |  |  |  | December 31, 2013
Type of Derivative Instrument |  | Accounting Designation |  | Balance Sheet Location: |  | Fair Value |  | Aggregate Notional Amount
Interest rate swaps |  | Non-hedging |  | Derivative assets |  | $ | 18,488 |  |  | $ | 575,000 |
Interest rate swaps |  | Non-hedging |  |  |  | $ | (1,336 | ) |  | $ | 215,000 |
Eurodollar futures |  | Non-hedging |  |  |  | (5,345 | ) |  | 9,000,000 |
|  |  |  | Derivative liabilities |  | $ | (6,681 | ) |  | $ | 9,215,000 |
|  |  |  |  |  | December 31, 2012
Type of Derivative Instrument |  | Accounting Designation |  | Balance Sheet Location: |  | Fair Value |  | Aggregate Notional Amount
Interest rate swaps |  | Hedging |  |  |  | $ | (39,813 | ) |  | $ | 1,435,000 |
Interest rate swaps |  | Non-hedging |  |  |  | (2,724 | ) |  | 27,000 |
|  |  |  | Derivative liabilities |  | $ | (42,537 | ) |  | $ | 1,462,000 |
Description of Derivative Activity Volume | The following table summarizes activity related to derivative instruments for the periods indicated:(amounts in thousands)Interest Rate Swaps Eurodollar FuturesNotional amount as of December 31, 2012:$1,462,000 $—Additions:380,000 20,250,000Settlements, terminations, or expirations:(1,052,000) (11,250,000)Notional amount as of December 31, 2013:(1)$790,000 $9,000,000(1)The Eurodollar futures notional amount as of December 31, 2013 represents the total notional of the 3-month contracts with expiration dates from 2016 to 2020. The maximum notional outstanding for any future 3-month period does not exceed $1,175,000.
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 December 31, 2013:
Remaining Maturity |  | Notional Amount: Trading |  | Weighted-Average Fixed Rate Swapped
37-48 months |  | 185,000 |  |  | 0.92 | %
49-60 months |  | 15,000 |  |  | 2.17 | %
61-72 months |  | 385,000 |  |  | 1.58 | %
73-84 months |  | 25,000 |  |  | 1.61 | %
109-127 months |  | 180,000 |  |  | 2.13 | %
|  | $ | 790,000 |  |  | 1.56 | %
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] | The tables below summarize the effect of the Company's interest rate derivatives reported in "loss on derivative instruments, net" on the Company's consolidated statements of net income for the periods indicated:
|  | Year Ended
|  | December 31,
Type of Derivative Instrument |  | 2013 |  | 2012 |  | 2011
Interest rate swaps |  | $ | 9,315 |  |  | $ | (908 | ) |  | $ | (2,825 | )
Eurodollar futures |  | (19,391 | ) |  | — |  |  | — |
Loss on derivative instruments, net |  | $ | (10,076 | ) |  | $ | (908 | ) |  | $ | (2,825 | )

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- Definition Information that would enable users to understand the volume of the entity's derivative activity. + References Reference 1: 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=7476318&loc=SL5580258-113959 Reference 2: 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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- 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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