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Commitments And Contingencies (Other Contingencies) (Details) (USD $) |  |  | 3 Months Ended |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |
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Dec. 31, 2012 | Mar. 31, 2007 | Dec. 31, 2011 Environmental Claims For A Site In Goodyear Arizona [Member] | Dec. 31, 2008 Environmental Claims For A Site In Goodyear Arizona [Member] | Dec. 31, 2012 Environmental Claims For A Site In Goodyear Arizona [Member] | Dec. 31, 2007 Environmental Claims For A Site In Goodyear Arizona [Member] | Jul. 31, 2006 Environmental Claims For A Site In Goodyear Arizona [Member] | Dec. 31, 2012 Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site [Member] acre | Dec. 31, 2011 Environmental Claims For Site In Roseland New Jersey [Member] Homeowner | Dec. 31, 2011 Environmental Claims For Site In Roseland New Jersey [Member] Home | Apr. 15, 2011 Environmental Claims For Site In Roseland New Jersey [Member] Home | Jan. 08, 2010 Merrimac Securities Class Action Lawsuit [Member] | Dec. 31, 2012 Negligence Lawsuit Rising From Fire Damage [Member] Lawsuit | Jan. 11, 2013 Subsequent Event [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated liability |  |  |  | $ 65,200,000 | $ 49,800,000 | $ 41,500,000 |  |  |  |  |  |  |  |
Additional charge |  |  | 30,300,000 | 24,300,000 |  |  |  |  |  |  |  |  |  |
Accrued environmental loss contingencies, current portion of total gross estimated liability |  |  |  |  | 16,000,000 |  |  |  |  |  |  |  |  |
Other receivables |  |  |  |  | 10,900,000 |  |  |  |  |  |  |  |  |
Stock price per share |  |  |  |  |  |  |  |  |  |  |  | $ 16.00 |  |
Settlement fund |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000
Contribution by Company to settlement fund |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000
Estimate of lost profits |  |  |  |  |  |  |  |  |  |  |  |  | 260,000,000 |
Approximate size of referenced site, acres |  |  |  |  |  |  |  | 55,000 |  |  |  |  |  |
Number of separate lawsuits consolidated into one lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
Approximate number of homes tested for contaminants |  |  |  |  |  |  |  |  | 40 | 40 |  |  |  |
Number of homes where contaminants were found |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |
Number of tenants who filed a separate lawsuit |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of members in the purported class |  |  |  |  |  |  |  |  | 141 | 141 |  |  |  |
Loss contingency reimbursement rate |  |  |  |  |  |  | 21.00% |  |  |  |  |  |  |
Residual value guarantee liability | 5,200,000 | 14,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  | $ 22,100,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -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 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161 -Subparagraph a -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 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 + Details
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- Definition Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6393211&loc=d3e13022-110858 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161 -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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