2.2.0.7 false Off-Balance Sheet Arrangements 01070 - Disclosure - Off-Balance Sheet Arrangements true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 EPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Disclosure - Off-Balance Sheet Arrangements [Abstract] 0 us-gaap_FairValueOffBalanceSheetRisksAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Off Balance Sheet Arrangements 1 us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTextBlock us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 9. Off-Balance Sheet ArrangementsOn April 28, 2010, under the terms of the amendment to the forward sale agreement with the forward counterparty, the remaining $200 million forward sale agreement matured. Subsequent to maturity and commencing on April 28, 2010, there was a 40 day valuation period, whereby the Company could deliver up to 3.4 million common shares over the valuation period, subject to a minimum price per share of $59.05 and a maximum price per share of $84.15. As a result of the Company's share price trading between the minimum and the maximum price per share during the valuation period, the Company did not deliver any common shares to the forward counterparty. See Off-Balance Sheet Arrangements in Notes 15 and 18 to Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2009. 9. Off-Balance Sheet ArrangementsOn April 28, 2010, under the terms of the amendment to the forward sale agreement with the forward counterparty, the false false false us-types:textBlockItemType textblock This item represents the complete disclosure regarding the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) which is not recognized as liabilities in the financial statements (off-balance-sheet) because they fail to meet some other criterion for recognition. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 7 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 3 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 7, 10 false 1 2 false UnKnown UnKnown UnKnown false true