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Accounting for Derivatives (Details) (USD $) | 1 Months Ended |  | 12 Months Ended |  |  |  |  |  |  | 3 Months Ended |
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Nov. 30, 2010 | Dec. 31, 2012 country | Dec. 31, 2010 Designated as a hedging instrument Interest rate hedges | Dec. 31, 2012 Designated as a hedging instrument Interest rate hedges | Dec. 31, 2011 Designated as a hedging instrument Interest rate hedges | Dec. 31, 2012 Designated as a hedging instrument Interest rate hedges Accrued liabilities | Dec. 31, 2011 Designated as a hedging instrument Interest rate hedges Accrued liabilities | Dec. 31, 2012 Designated as a hedging instrument Interest rate hedges Other long-term liabilities | Dec. 31, 2011 Designated as a hedging instrument Interest rate hedges Other long-term liabilities | Dec. 31, 2010 Terminated hedge Interest rate hedges | Dec. 31, 2012 Terminated hedge Interest rate hedges
Accounting for Derivatives |  |  |  |  |  |  |  |  |  |  |
Number of countries in which the company operates |  | 30 |  |  |  |  |  |  |  |  |
Fair Value Asset (Liability) |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate swaps |  |  |  | $ 250,000,000 |  |  |  |  |  | $ 585,000,000 |
Weighted average effective fixed interest rate on interest rate swaps (as a percent) |  |  |  | 1.80% |  |  |  |  |  | 4.60% |
Interest expense on the ineffectiveness of interest rate swaps |  |  | 200,000 |  |  |  |  |  |  |  |
Deferred pre-tax loss to be reclassified during next 12 months |  |  |  | 3,900,000 |  |  |  |  |  |  | 1,600,000
Amount of interest rate swap termination payments | 14,800,000 |  |  |  |  |  |  |  |  | 43,000,000 |
Derivatives liability designated as hedging instruments, Fair value |  |  |  | $ (9,916,000) | $ (19,446,000) | $ (3,873,000) | $ (14,250,000) | $ (6,043,000) | $ (5,196,000) |  |

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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -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 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 The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -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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