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Derivatives (Tables) | 6 Months Ended
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Jun. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments [Table Text Block] | The table below provides additional information related to the forward-starting swaps that are included in the preceding table:
Forward-Start Date | Notional Amount |  | Weighted-Average Fixed Rate Swapped
March 25, 2013 | $ | 100,000 |  |  | 1.89 | %
April 15, 2013 | 25,000 |  |  | 1.70 | %
January 8, 2013 | 150,000 |  |  | 0.77 | %
| $ | 275,000 |  |  | 1.62 | %
The tables below summarize information about the Company’s derivative financial instruments on the balance sheet as of the dates indicated:
|  | June 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 |  | $ | (36,551 | ) |  | $ | 1,485,000 |  |  | 1.50 | % |  | $ | (25,512 | ) |  | $ | 1,065,000 |  |  | 1.55 | %
Trading instruments |  | (2,716 | ) |  | 27,000 |  |  | 2.88 | % |  | (2,485 | ) |  | 27,000 |  |  | 2.88 | %
| Derivative liabilities | $ | (39,267 | ) |  |  |  |  |  | $ | (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 June 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 |  |  | 260,000 |  |  | 287,000 |  |  | 11 |  |  | 2.04 | %
Over 60 months | — |  |  | 585,000 |  |  | 585,000 |  |  | 19 |  |  | 1.39 | %
| $ | 27,000 |  |  | $ | 1,485,000 |  |  | $ | 1,512,000 |  |  | 42 |  |  | 1.53 | %
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 |  | Six Months Ended
|  | June 30, 2012 |  | June 30, 2011 |  | June 30, 2012 |  | June 30, 2011
Interest rate swaps | Fair value adjustments, net | $ | (500 | ) |  | $ | (871 | ) |  | $ | (574 | ) |  | $ | (1,204 | )
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 June 30, 2012: |
Interest rate swaps | $(14,693) | Interest expense | $3,509 | Other income, net | $131
For the three months ended June 30, 2011: |  |  |
Interest rate swaps | $(14,810) | Interest expense | $3,072 | Other income, net | $(25)
For the six months ended June 30, 2012: |  |  |
Interest rate swaps | $(17,780) | Interest expense | $6,775 | Other income, net | $69
For the six months ended June 30, 2011: |  |  |
Interest rate swaps | $(13,722) | Interest expense | $4,941 | Other income, net | $(24)
The table below presents a rollforward of the activity in the Company’s AOCI related to its derivatives designated as hedging instruments for the periods presented:
| Three Months Ended |  | Six Months Ended
| June 30, 2012 |  | June 30, 2011 |  | June 30, 2012 |  | June 30, 2011
Balance as of beginning of period | $ | (25,265 | ) |  | $ | 137 |  |  | $ | (25,444 | ) |  | $ | (2,820 | )
Change in fair value of interest rate swaps | (14,693 | ) |  | (14,810 | ) |  | (17,780 | ) |  | (13,722 | )
Reclassification adjustment for amounts included in statement of income | 3,509 |  |  | 3,072 |  |  | 6,775 |  |  | 4,941 |
Balance as of end of period | $ | (36,449 | ) |  | $ | (11,601 | ) |  | $ | (36,449 | ) |  | $ | (11,601 | )

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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 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 4 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959 Reference 2: 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=7476318&loc=d3e41678-113959 Reference 3: 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 4: 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=6881521&loc=d3e23780-122690 Reference 5: 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=7476318&loc=SL5579245-113959 Reference 6: 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 7: 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=7476318&loc=d3e41620-113959 Reference 8: 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 9: 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=7476318&loc=d3e41641-113959 Reference 10: 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=7476318&loc=SL5579240-113959 Reference 11: 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=7476318&loc=SL5624171-113959 + 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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