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Derivative financial instruments for hedging purposes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Derivative, Notional Amount | $ 840,796 |  | $ 461,743 |  |
Derivative financial instruments used for hedging - receivable | 19,239 | [1] | 4,159 | [1] | 2,103
Derivative financial instruments used for hedging - payable | 11,747 | [1] | 53,742 | [1] |
Derivative, Net Hedge Ineffectiveness Gain (Loss) | 71 | [2] | 2,849 | [2] |
Fair Value Hedging [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative, Notional Amount | 480,000 |  | 125,000 |  |
Derivative financial instruments used for hedging - receivable | 8,319 | [1] | 16 | [1] |
Derivative financial instruments used for hedging - payable | 6,600 | [1] | 10,317 | [1] |
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Derivative, Notional Amount | 236,866 |  | 215,107 |  |
Derivative financial instruments used for hedging - receivable | 3,525 | [1] | 56 |  |
Derivative financial instruments used for hedging - payable | 4,665 | [1] | 40,574 |  |
Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative, Notional Amount | 0 |  | 20,000 |  |
Derivative financial instruments used for hedging - receivable | 0 | [1] | 0 | [1] |
Derivative financial instruments used for hedging - payable | 0 | [1] | 512 | [1] |
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Derivative, Notional Amount | 42,001 |  | 42,336 |  |
Derivative financial instruments used for hedging - receivable | 7,333 | [1] | 3,549 | [1] |
Derivative financial instruments used for hedging - payable | 23 | [1] | 0 | [1] |
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Derivative, Notional Amount | 75,733 |  | 53,264 |  |
Derivative financial instruments used for hedging - receivable | 62 | [1] | 249 | [1] |
Derivative financial instruments used for hedging - payable | 411 | [1] | 2,339 | [1] |
Net Investment Hedging [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Derivative, Notional Amount | 6,196 |  | 6,036 |  |
Derivative financial instruments used for hedging - receivable | 0 | [1] | 289 | [1] |
Derivative financial instruments used for hedging - payable | $ 48 | [1] | $ 0 | [1] |
[1] | The fair value of assets and liabilities is reported within the derivative financial instruments used for hedging - receivable and payable lines in the consolidated balance sheets, respectively.
[2] | Gains and losses resulting from ineffectiveness and credit risk in hedging activities are reported within the derivative financial instruments and hedging line in the consolidated statements of income.

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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 values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition The portion of a hedge deemed to be ineffective that is reflected in current period results of operations. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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