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Derivative Financial Instruments Fair Value (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Fair value of derivative assets and liabilities |  |
Derivative asset | $ 58,071 | $ 37,873
Derivative asset | 28,798 | 16,466
Derivative liability | 4,748 | 8,999
Derivatives liability | 1,525 | 6,645
Derivative Asset, Fair Value, Amount Offset Against Collateral | 86,869 | 54,339
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (6,273) | (13,400)
Derivative Asset, Fair Value, Amount Offset Against Collateral, Net | 80,596 | 40,939
Derivative Liability, Fair Value, Amount Offset Against Collateral | (6,273) | (15,644)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 6,273 | 13,400
Derivative Liability, Fair Value, Amount Offset Against Collateral, Net | 0 | (2,244)
Derivatives not designated as hedging instruments |  |
Fair value of derivative assets and liabilities |  |
Derivative asset | 58,071 | 37,873
Derivative asset | 28,798 | 16,466
Derivative liability | 4,748 | 8,999
Derivatives liability | 1,525 | 6,645
Level 2 | Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] |  |
Fair value of derivative assets and liabilities |  |
Derivative assets not designated as hedging instruments | 86,869 | 54,339
Derivative liabilities not designated as hedging instruments | $ 6,273 | $ 15,644

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- Definition Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, 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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4 -Chapter 3 -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 6: 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 7: 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 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Assets -URI http://asc.fasb.org/extlink&oid=6509628 + Details
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