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Shareholders' Equity (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2012 At The Market Offering Program [Member] | Dec. 31, 2010 At The Market Offering Program [Member]
Financing Agreements [Line Items] |  |  |  |  |
Issuance and sale of stock, term |  |  |  | 36 months |
Common stock reserved for future issuance | $ 250,000,000 |  |  |  |
Common shares issued | 66,437 | 66,265 |  |  | 5,645
Weighted average issue price |  |  |  |  | $ 30.34
Net proceeds | 0 | 0 | 168,880,000 |  | 168,881,000
Shares issued under Dividend Reinvestment Program, shares | 55 | 171 | 175 |  |
Weighted average issue price, dividend reinvestment program | $ 29.67 | $ 29.97 | $ 30.36 |  |
Net proceeds, dividend reinvestment program | $ 1,316,000 | $ 5,043,000 | $ 5,286,000 |  |

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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