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Equity (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds of Common Stock sold |  |  |  |  | $ 23,270,000 | $ 2,998,000 | $ 150,941,000
Dividends declared and paid per Common Stock (in dollars per share) |  |  |  |  | $ 1.70 | $ 1.70 | $ 1.70
Excess of Preferred Stock redemption/repurchase cost over carrying value | 0 | 0 | 1,895,000 | 0 | 1,895,000 | 0 | 0
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |
Ordinary income |  |  |  |  | $ 1.15 | $ 0.41 | $ 1.09
Capital gains |  |  |  |  | $ 0.00 | $ 0.44 | $ 0.60
Return of capital |  |  |  |  | $ 0.55 | $ 0.85 | $ 0.01
Total taxability of dividends per share |  |  |  |  | $ 1.70 | $ 1.70 | $ 1.70
Warrants [Abstract] |  |  |  |  |  |  |
Warrants to acquire Common Stock, outstanding | 15,000 |  |  |  | 15,000 | 15,000 |
Exercise price of outstanding warrants | 32.50 |  |  |  | 32.50 | 32.50 |
ATM Equity Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of Common Stock sold at the market (in shares) |  |  |  |  | 378,200 |  |
Average price of Common Stock sold at the market |  |  |  |  | $ 35.09 |  |
Net proceeds of Common Stock sold at the market |  |  |  |  | 13,100,000 |  |
Issuance of Equity [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of Common Stock sold (in shares) |  |  |  |  |  |  | 7,000,000
Proceeds of Common Stock sold |  |  |  |  |  |  | 144,100,000
Series A Cumulative Redeemable Preferred Shares [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance date, Preferred Stock |  |  |  |  | Feb. 12, 1997 | Feb. 12, 1997 |
Number of shares outstanding, Preferred Stock (in shares) | 29,077 |  |  |  | 29,077 | 29,092 |
Carrying value, Preferred Stock | 29,077,000 |  |  |  | 29,077,000 | 29,092,000 |
Liquidation preference per share, Preferred Stock (in dollars per share) | $ 1,000 |  |  |  | $ 1,000 | $ 1,000 |
Optional redemption date, Preferred Stock |  |  |  |  | Feb. 12, 2027 | Feb. 12, 2027 |
Annual dividends payable per share, Preferred Stock (in dollars per share) |  |  |  |  | $ 86.25 | $ 86.25 | $ 86.25
Dividends, Preferred Stock [Abstract] |  |  |  |  |  |  |
Ordinary income |  |  |  |  | $ 86.25 | $ 41.80 | $ 55.86
Capital gains |  |  |  |  | $ 0.00 | $ 44.45 | $ 30.39
Total taxability of dividends per share |  |  |  |  | $ 86.25 | $ 86.25 | $ 86.25
Series B Cumulative Redeemable Preferred Shares [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of Preferred Stock redeemed during period (in shares) |  |  |  |  | 2,100,000 |  |
Redemption price of Preferred Stock redeemed during period |  |  |  |  | 52,500,000 |  |
Excess of Preferred Stock redemption/repurchase cost over carrying value |  |  |  |  | 1,900,000 |  |
Issuance date, Preferred Stock |  |  |  |  |  | Sep. 25, 1997 |
Number of shares outstanding, Preferred Stock (in shares) | 0 |  |  |  | 0 | 2,100,000 |
Carrying value, Preferred Stock | $ 0 |  |  |  | $ 0 | $ 52,500,000 |
Liquidation preference per share, Preferred Stock (in dollars per share) | $ 0 |  |  |  | $ 0 | $ 25 |
Optional redemption date, Preferred Stock |  |  |  |  |  | Sep. 25, 2002 |
Annual dividends payable per share, Preferred Stock (in dollars per share) |  |  |  |  | $ 1.05 | $ 2.00 | $ 2.00
Dividends, Preferred Stock [Abstract] |  |  |  |  |  |  |
Ordinary income |  |  |  |  | $ 1.05 | $ 0.97 | $ 1.30
Capital gains |  |  |  |  | $ 0.00 | $ 1.03 | $ 0.70
Total taxability of dividends per share |  |  |  |  | $ 1.05 | $ 2.00 | $ 2.00

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