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Shareholders' Equity (Details) (USD $) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |
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Mar. 31, 2011 | Feb. 28, 2011 | Feb. 28, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2002 | Dec. 31, 2012 Mezzanine Operating Partnership Units [Member] | Feb. 12, 2013 Series B [Member] | Sep. 11, 2012 Series B [Member] | May 31, 2012 Series B [Member] | Dec. 31, 2012 Series B [Member] | Sep. 14, 2012 Series B [Member] | Dec. 31, 2011 Series B [Member] | Feb. 07, 2013 Series A [Member] | Dec. 31, 2012 Series A [Member] | Dec. 31, 2011 Series A [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OP units converted |  |  |  | 1,134,000 |  |  |  | 564,000 |  |  |  |  |  |  |  |  |
Carrying value of OP Units reclassified to equity |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |
Shares issued in public offering |  |  |  |  |  |  |  |  | 2,000,000 | 4,200,000 | 400,000 |  |  |  |  |  |
Dividend rate percentage |  |  |  |  |  |  |  |  |  |  |  | 7.25% |  |  |  | 8.875% |
Public offering, per share |  |  |  |  |  |  |  |  | $ 24.58 | $ 23.94 | $ 23.00 |  |  |  |  |  |
Public offering, realized net proceeds, net offering expenses |  |  |  |  |  |  |  |  | 47,600,000 | 96,800,000 | 8,600,000 |  |  |  |  |  |
Additional shares issued to underwriters |  |  |  |  |  |  |  |  | 300,000 |  |  |  | 630,000 |  |  |  |
Net proceeds realized from issuance of additional shares to underwriters |  |  |  |  |  |  |  |  | 7,100,000 |  |  |  | 14,500,000 |  |  |  |
ATM equity program, shares issued |  |  | 220,000 |  |  |  |  |  |  |  |  | 199,000 |  |  |  |  |
ATM equity program, weighted average price per share |  |  | $ 24.52 |  |  |  |  |  |  |  |  | $ 23.23 |  |  |  |  |
ATM equity program, realized net proceeds, net offering expenses |  |  | 5,300,000 |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  |  |
Liquidation preference, per share |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  | $ 25.00 |  | $ 25.00 | $ 25.00
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  | $ 25.00 |
Shares of Redeemable Preferred Stock redeemed and purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,408,000 | 4,992,000 |
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,400,000 | 126,400,000 |
Preferred stock redemption costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |
Preferred stock accrued dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |
Stock price as percentage of market value | 100.00% | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under DRIP |  |  |  | 1,000 | 693,000 |  |  |  |  |  |  |  |  |  |  |  |
Price per share issued under DRIP |  |  |  | $ 4.96 | $ 6.02 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock shares under DRIP |  |  |  | 6,000 | 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares authorized under DRIP |  |  |  | 2,854,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of OP units called by warrants |  |  |  |  |  |  | 83,000 |  |  |  |  |  |  |  |  |  |
Warrant exercise price |  |  |  |  |  |  | $ 13.50 |  |  |  |  |  |  |  |  |  |
Cash received from litigation settlement |  |  |  |  | 225,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to connection to litigation settlement |  |  |  |  | 39,000 |  |  |  |  |  |  |  |  |  |  |  |
Price per share |  |  |  |  | $ 5.78 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  | 225,000 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to common shareholders |  |  |  | 14,402,000 | 24,705,000 | 22,445,000 |  |  |  |  |  |  |  |  |  |  |
Accrued preferred stock dividends |  |  |  | $ 1,700,000 | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |

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