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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 | 1 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | May 31, 2012 ATM Equity Program | Dec. 31, 2013 ATM Equity Program | Dec. 31, 2012 ATM Equity Program | Mar. 31, 2013 2013 ATM Equity Program | Dec. 31, 2013 2013 ATM Equity Program | Feb. 29, 2012 DRIP | Dec. 31, 2013 DRIP | Dec. 31, 2012 DRIP | Dec. 31, 2011 DRIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares | 8,050,000 | 9,200,000 | 29,013 | 40,460 | 17,288,265 |  | 4,676,542 |  | 4,282,298 |  |  | 2,280,450 |  |  |  |  |
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 | $ 267,613 | $ 185,223 | $ 540,560 |  |  |  |  |  |  |  |  |  | $ 25,407 | $ 56,102 | $ 93,451
Stock issuance costs | 9,060 | 10,393 | 3,774 | 2,265 | 19,453 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be issued |  |  |  |  |  | 9,000,000 |  |  |  |  | 9,000,000 |  |  |  |  |  |
Average stock price per share |  |  |  |  |  |  | $ 32.60 |  | $ 29.64 |  |  | $ 37.80 |  |  |  |  |
Issuance of common stock |  |  | 744 | 833 | 447,863 |  | 152,435 |  | 126,947 |  |  | 86,208 |  |  |  |  |
Stock issuance costs |  |  | $ 13,529 | $ 12,237 | $ 19,328 |  | $ 2,161 | [1] | $ 2,145 | [1] |  | $ 1,613 | [1] |  |  |  |
Shares reserved for future issuance, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |
Shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 764,891 | 2,101,644 | 3,745,896
[1] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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