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Derivatives (Tables) | 9 Months Ended
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Sep. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The tables below summarize information about the Company’s derivative financial instruments on the balance sheet as of the dates indicated:
|  | September 30, 2012 |  | December 31, 2011
Accounting Designation: | Balance Sheet Location: | Fair Value |  | Cumulative Notional Amount |  | Weighted-average Fixed Rate Swapped |  | Fair Value |  | Cumulative Notional Amount |  | Weighted-average Fixed Rate Swapped
Hedging instruments |  | $ | (43,802 | ) |  | $ | 1,485,000 |  |  | 1.50 | % |  | $ | (25,512 | ) |  | $ | 1,065,000 |  |  | 1.55 | %
Trading instruments |  | (2,694 | ) |  | 27,000 |  |  | 2.88 | % |  | (2,485 | ) |  | 27,000 |  |  | 2.88 | %
| Derivative liabilities | $ | (46,496 | ) |  |  |  |  |  | $ | (27,997 | ) |  |  |  |
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 September 30, 2012:
Remaining Maturity | Notional Amount: Trading |  | Notional Amount: Hedging |  | Notional Amount: Total |  | Number of Swaps |  | Weighted-Average Fixed Rate Swapped
0-12 months | $ | — |  |  | $ | 75,000 |  |  | $ | 75,000 |  |  | 2 |  |  | 1.30 | %
13-36 months | — |  |  | 565,000 |  |  | 565,000 |  |  | 10 |  |  | 1.44 | %
37-60 months | 27,000 |  |  | 445,000 |  |  | 472,000 |  |  | 16 |  |  | 1.60 | %
Over 60 months | — |  |  | 400,000 |  |  | 400,000 |  |  | 14 |  |  | 1.60 | %
| $ | 27,000 |  |  | $ | 1,485,000 |  |  | $ | 1,512,000 |  |  | 42 |  |  | 1.53 | %
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | The table below presents the effect of the derivatives designated as hedging instruments on the Company’s consolidated statement of comprehensive income for the periods indicated:
Type of Derivative Designated as Cash Flow Hedge | Amount of Gain (Loss) Recognized in OCI (Effective Portion) | Location of Amount Reclassified from OCI into Net Income (Effective Portion) | Amount Reclassified from OCI into Net Income (Effective Portion) | Location of Loss Recognized in Net Income (Ineffective Portion) | Amount of Gain (Loss) Recognized in Net Income (Ineffective Portion)
For the three months ended September 30, 2012: |
Interest rate swaps | $(11,073) | Interest expense | $3,827 | Other income, net | $(107)
For the three months ended September 30, 2011: |  |  |
Interest rate swaps | $(18,251) | Interest expense | $3,383 | Other income, net | $(31)
For the nine months ended September 30, 2012: |  |  |
Interest rate swaps | $(28,853) | Interest expense | $10,602 | Other income, net | $(38)
For the nine months ended September 30, 2011: |  |  |
Interest rate swaps | $(31,974) | Interest expense | $8,325 | Other income, net | $(55)
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] | The table below presents the effect of the derivatives designated as trading instruments on the Company’s consolidated statements of income for the periods indicated.
Type of Derivative Designated as Trading | Location On Income Statement | Amount of Loss Recognized in Net Income
Three Months Ended |  | Nine Months Ended
|  | September 30, 2012 |  | September 30, 2011 |  | September 30, 2012 |  | September 30, 2011
Interest rate swaps | Fair value adjustments, net | $ | (333 | ) |  | $ | (1,446 | ) |  | $ | (907 | ) |  | $ | (2,649 | )

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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + 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 50 -Paragraph 4F -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624186-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=7485890&loc=SL5634876-113961 + 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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=7476318&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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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