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Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | May 31, 2012 ATM Equity Program [Member] | Dec. 31, 2012 ATM Equity Program [Member] | Feb. 29, 2012 DRIP [Member] | Dec. 31, 2012 DRIP [Member] | Dec. 31, 2011 DRIP [Member] | Dec. 31, 2010 DRIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares | 8,050,000 | 9,200,000 | 40,460 | 17,288,265 | 39,872 |  | 4,282,298 |  |  |  |  |
Underwriters over allotment Of shares | 1,050,000 | 1,200,000 |  |  |  |  |  |  |  |  |  |
Shares Issued, price per share | $ 25.75 | $ 26.07 |  | $ 25.75 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 198,228 | $ 229,451 | $ 185,223 | $ 540,560 | $ 17,692 |  |  |  |  | $ 56,102 | $ 93,451 | $ 17,623
Stock issuance costs | 9,060 | 10,393 | 2,265 | 19,453 | 1 |  |  |  |  |  |  |
Number of shares authorized to be issued |  |  |  |  |  | 9,000,000 |  |  |  |  |  |
Equity program, period in force |  |  |  |  |  | 3 years |  |  |  |  |  |
Average stock price per share |  |  |  |  |  |  | $ 29.64 |  |  |  |  |
Issuance of common stock |  |  | 833 | 447,863 | 698 |  | 126,947 |  |  |  |  |
Stock issuance costs |  |  | $ 12,237 | $ 19,328 | $ 1 |  | $ 2,145 | [1] |  |  |  |
Shares reserved for future issuance, dividend reinvestment plan |  |  |  |  |  |  |  |  | 16,000,000 |  |  |
Shares of common stock |  |  |  |  |  |  |  |  |  | 2,101,644 | 3,745,896 | 793,759
[1] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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