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Common Share Capitalization (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 14 Months Ended | 0 Months Ended | ||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Dec. 31, 2011
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Aug. 20, 2012
Secondary Offering Public [Member]
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Sep. 12, 2012
Secondary Offering Overallotment Option [Member]
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| Common Stock Capitalization [Line Items] | ||||||||
| Common stock, shares issued | 20,483,696 | 20,483,696 | 20,483,696 | 16,447,651 | 3,500,000 | 525,000 | ||
| Net proceeds from issuance of shares | $ 76,700,000 | $ 11,100,000 | ||||||
| Overallotment option percentage by underwriters | 15.00% | |||||||
| Aggregate cost of shares repurchase | 10,000,000 | |||||||
| Shares repurchased under share repurchase program | 0 | 17,500 | 0 | 17,500 | 60,980 | |||
| Aggregate cost of shares repurchased | 0 | 309,000 | 0 | 309,000 | 1,100,000 | |||
| Average price per share repurchased | $ 17.22 | |||||||
| Dividend Per Share | $ 0.70 | $ 0.40 | $ 1.80 | $ 2.11 | ||||
| Dividend Amount | $ 14,200,000 | $ 6,800,000 | $ 32,800,000 | $ 35,600,000 | ||||