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Debt (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 Unsecured Letter Of Credit Facility [Member] | Jul. 02, 2012 Unsecured Letter Of Credit Facility [Member] | Dec. 31, 2011 Unsecured Letter Of Credit Facility [Member] | Jun. 30, 2012 Letter Of Credit [Member] | Dec. 31, 2011 Letter Of Credit [Member]
Debt Instrument |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 0 | $ 53,000,000 |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  | 0 | (3,537,000) |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 200,000,000 | 150,000,000 |  |  |
Subsequent Event, Date |  |  | Jul. 02, 2012 |  |  |  |  |  |  |
Credit facility expiration date |  |  |  |  |  | Jun. 01, 2014 |  |  |  |
Letters of Credit Outstanding, Amount | $ 200,500,000 |  | $ 200,500,000 |  | $ 235,900,000 | $ 133,600,000 |  | $ 152,700,000 | $ 66,900,000 | $ 83,200,000

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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