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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended
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Feb. 29, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Feb. 29, 2012 Series D Depositary Share [Member] | Jun. 30, 2013 Series D Depositary Share [Member] | Jun. 30, 2012 Series D Depositary Share [Member] | Jun. 30, 2013 Series D Depositary Share [Member] | Jun. 30, 2012 Series D Depositary Share [Member] | Dec. 31, 2012 Series D Depositary Share [Member] | Mar. 31, 2012 Series C Depositary Share [Member] | Jun. 30, 2013 Series C Depositary Share [Member] | Jun. 30, 2012 Series C Depositary Share [Member] | Jun. 30, 2013 Series C Depositary Share [Member] | Jun. 30, 2012 Series C Depositary Share [Member] | May 31, 2013 Series E Depositary Share [Member] | Jun. 30, 2013 Series E Depositary Share [Member] | Jun. 30, 2012 Series E Depositary Share [Member] | Dec. 31, 2012 Series E Depositary Share [Member] | Jun. 30, 2013 DRIP and ATM Equity Program [Member] | Jun. 30, 2012 DRIP and ATM Equity Program [Member] | Jun. 30, 2013 ATM Equity Program 2012 [Member] | Jun. 30, 2012 ATM Equity Program 2012 [Member] | May 31, 2012 ATM Equity Program 2012 [Member] Common Stock [Member] | Jun. 30, 2013 ATM Equity Program 2013 [Member] | Jun. 30, 2012 ATM Equity Program 2013 [Member] | Mar. 31, 2013 ATM Equity Program 2013 [Member] Common Stock [Member] | Jul. 31, 2013 Subsequent Event [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  | $ 4,762 | $ 5,926 | $ 9,523 | [1] | $ 5,926 | [1] |  |  | $ 0 | $ 0 | $ 0 | [2] | $ 1,979 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  |  |  |  |  |  | $ 0.8281 | [1] | $ 0.5153 | [1] |  |  |  |  | $ 0.0000 | [2] | $ 0.5378 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  | 90,943 | 81,511 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  | $ 0.790 | $ 0.770 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,676,542 |  | 394,901 |  |  | 2,280,450 |  | 0 |  |  |
Average price per share (net) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.60 |  | $ 26.66 |  |  | $ 37.83 |  | $ 0.00 |  |  |
Net proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152,435 |  | 10,527 |  |  | 86,271 |  | 0 |  |  |
Stock issuance costs |  | 13,416 | 10,393 | 9,855 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,856 |  |  |  |  |  | 2,161 | [3] | 253 | [3] |  | 1,551 | [3] | 0 | [3] |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.415625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 11,500,000 | 11,500,000 |  | 11,500,000 |  |  |  | 0 |  |  |  |  |  |  |  | 11,500,000 | 11,500,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 6.625% |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |  | 5.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share (in dollars per share) |  |  |  | $ 25.00 |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Series E preferred stock |  |  |  | 287,500 |  |  | 0 |  | 287,500 |  |  |  |  |  |  |  |  |  | 287,500 | 287,500 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed or called during period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,680,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, fixed annual dividend per share, depository shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25.0768229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption premium |  |  |  |  |  |  |  |  |  |  |  | 3,098 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance under at market offering program (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  |  | 9,000,000 |
Common stock, dividends, per share, declared (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.405
Common stock, shares reserved for future issuance, dividend reinvestment plan (in shares) | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 475,866 | 1,881,807 |  |  |  |  |  |  |  |  |  |  |
Net proceeds |  | $ 258,085 | $ 60,319 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,881 | $ 49,476 |  |  |  |  |  |  |  |  |  |  |
[1] | The Series D preferred stock has no maturity date and will remain outstanding unless redeemed.
[2] | The Series C preferred stock was redeemed in March 2012. The dividends paid during the six months ended June 30, 2012 include accumulated and unpaid dividends through the redemption date.
[3] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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