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Risk Management and Derivatives (Outstanding foreign currency derivatives - non-designated hedge) (Details) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2013 Sells EUR/Buys USD Forward USD ($) | Sep. 30, 2013 Sells EUR/Buys USD Forward EUR (€) | Sep. 30, 2013 Sells GBP/Buys USD Forward USD ($) | Sep. 30, 2013 Sells GBP/Buys USD Forward GBP (£) | Sep. 30, 2013 Sells CAD/Buys USD Forward USD ($) | Sep. 30, 2013 Sells CAD/Buys USD Forward CAD | Sep. 30, 2013 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($) | Sep. 30, 2012 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($) | Sep. 30, 2013 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($) | Sep. 30, 2012 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  | $ 114,155,000 | € 84,400,000 | $ 44,512,000 | £ 27,500,000 | $ 41,832,000 | 43,100,000 |  |  |  |
Derivative instruments, gain (loss) recognized in income, net |  |  |  |  |  |  |  |  |  |  | (7,992,000) | (6,658,000) | 1,750,000 | (5,326,000)
Gain (loss) on foreign investments | $ (1,100,000) | $ (500,000) | $ (1,500,000) | $ (800,000) |  |  |  |  |  |  |  |  |  |

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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 b -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 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 -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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