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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Feb. 29, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  | $ 88,694 |  | $ 76,098 |  |  |
Total allowable shares |  |  | 375,000,000 |  | 375,000,000 |  |  |  | 375,000,000 |
Total shares issued |  |  | 134,434,132 |  | 134,434,132 |  |  |  | 132,010,104 |
Stock issuance costs |  |  |  |  | $ 1,623 |  | 1,104 |  |  |
Common Stock Dividends |  |  |  |  | $ 111,400 |  | $ 98,958 |  |  |
Common Stock Per share |  |  |  |  | $ 0.840 |  | $ 0.810 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) |  | $ 0.435 |  |  |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock Dividends |  |  | $ 4,762 | $ 4,762 | $ 9,523 | [1] | $ 9,523 | [1] |  |
Preferred Stock Per share | [1] |  |  |  | $ 0.828125 |  | $ 0.828125 |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock Dividends |  |  | $ 4,096 | $ 4,096 | $ 8,194 | [1] | $ 8,194 | [1] |  |
Preferred Stock Per share | [1] |  |  |  | $ 0.712500 |  | $ 0.712500 |  |  |
DRIP |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock |  |  |  |  | 82,271 |  | 290,399 |  |  |
Net proceeds |  |  |  |  | $ 3,019 |  | $ 9,814 |  |  |
Total allowable shares |  |  |  |  |  |  |  |  |  | 16,000,000
2015 ATM |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total allowable shares |  |  | 10,000,000 |  | 10,000,000 |  |  |  |  |
Total shares issued |  |  | 1,910,873 |  | 1,910,873 |  |  |  |  |
Shares of common stock |  |  |  |  | 1,910,873 |  |  |  |  |
Average price per share (net) |  |  |  |  | $ 39.70 |  |  |  |  |
Net proceeds |  |  |  |  | $ 75,857 |  |  |  |  |
Stock issuance costs | [2] |  |  |  | $ 1,312 |  |  |  |  |
2013 ATM |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total allowable shares |  |  | 9,000,000 |  | 9,000,000 |  |  |  |  |
Total shares issued |  |  | 6,252,812 |  | 6,252,812 |  |  |  |  |
Shares of common stock |  |  |  |  | 214,000 |  | 1,861,206 |  |  |
Average price per share (net) |  |  |  |  | $ 39.84 |  | $ 35.21 |  |  |
Net proceeds |  |  |  |  | $ 8,525 |  | $ 65,526 |  |  |
Stock issuance costs | [2] |  |  |  | $ 130 |  | $ 1,065 |  |  |
2012 ATM |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total allowable shares |  |  | 9,000,000 |  | 9,000,000 |  |  |  |  |
Total shares issued |  |  | 8,958,840 |  | 8,958,840 |  |  |  |  |
[1] | The Series D and E preferred stock have no maturity date and will remain outstanding unless redeemed.
[2] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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