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Accounting for Derivatives (Details) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2012 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2013 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2012 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2013 Terminated hedge, May 2013 Interest rate hedges | May 31, 2013 Terminated hedge, May 2013 Interest rate hedges | Sep. 30, 2013 Terminated hedge, May 2013 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2013 Terminated hedge, May 2013 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2013 Designated as a hedging instrument Interest rate hedges | Sep. 30, 2012 Designated as a hedging instrument Interest rate hedges | Dec. 31, 2012 Designated as a hedging instrument Interest rate hedges | Sep. 30, 2013 Designated as a hedging instrument Interest rate hedges Accrued liabilities | Dec. 31, 2012 Designated as a hedging instrument Interest rate hedges Accrued liabilities | Sep. 30, 2013 Designated as a hedging instrument Interest rate hedges Other long-term liabilities | Dec. 31, 2012 Designated as a hedging instrument Interest rate hedges Other long-term liabilities | Dec. 31, 2010 Terminated hedge, 2010 Interest rate hedges | Sep. 30, 2013 Terminated hedge, 2010 Interest rate hedges | Sep. 30, 2013 Terminated hedge, 2010 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2013 Terminated hedge, 2010 Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2013 Amended designated as a hedging instrument Interest rate hedges | May 31, 2013 Amended designated as a hedging instrument Interest rate hedges | Sep. 30, 2013 Amended designated as a hedging instrument Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income | Sep. 30, 2013 Amended designated as a hedging instrument Interest rate hedges Losses from terminated interest rate swaps Reclassification out of accumulated other comprehensive income
Fair Value Asset (Liability) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate swaps |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  | $ 250,000,000 |  |  |  |  |  |  | $ 585,000,000 |  |  |  |  |  |  |
Weighted average effective fixed interest rate on interest rate swaps (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 1.70% |  |  |  |  |  |  | 4.60% |  |  |  |  |  |  |
Interest income recorded due to ineffectiveness related to interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Inception gain recorded in accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,200,000 |  |
Deferred pre-tax gain (loss) to be reclassified during next 12 months |  |  |  |  |  |  |  |  | (3,800,000) |  |  |  | (3,400,000) |  |  |  |  |  |  |  | (1,000,000) |  |  | 3,500,000 |  |  |
Derivatives liability designated as hedging instruments, Fair value |  |  |  |  |  |  |  |  |  | (8,800,000) |  |  |  |  |  | (3,374,000) | (3,873,000) | (1,230,000) | (6,043,000) |  |  |  |  |  |  |  |
Total derivatives, Fair value |  |  |  |  |  |  |  |  |  |  |  |  | (4,604,000) |  | (9,916,000) |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gains (losses) reclassified into interest expense | (28,882,000) | (31,723,000) | (87,006,000) | (106,682,000) | (800,000) | (4,300,000) | (2,500,000) | (22,200,000) |  |  | (1,000,000) | (1,600,000) |  |  |  |  |  |  |  |  |  | (300,000) | (1,300,000) |  |  | 900,000 | 1,300,000
Amount of interest rate swap termination payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -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 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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