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Long-Term Incentive Plan Units (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 61 Months Ended | 61 Months Ended | 0 Months Ended | 4 Months Ended | 61 Months Ended | 3 Months Ended | 9 Months Ended | 61 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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Sep. 30, 2012
Directors [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 12, 2012
Independent Directors [Member]
Long-Term Incentive Plan Units [Member]
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Dec. 31, 2007
Manager [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 30, 2012
Manager [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 30, 2012
Dedicated Personnel [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 30, 2012
Non-Manager [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 30, 2011
Non-Manager [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 30, 2012
Non-Manager [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 30, 2011
Non-Manager [Member]
Long-Term Incentive Plan Units [Member]
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Sep. 30, 2012
Non-Manager [Member]
Long-Term Incentive Plan Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||
| LTIP units granted | 24,096 | 5,346 | 375,000 | 5,500 | ||||||||||||
| Expenses associated with LTIP unit awards | $ 31,000 | $ 41,000 | $ 89,000 | $ 116,000 | $ 30,000 | $ 40,000 | $ 90,000 | $ 120,000 | $ 500,000 | |||||||
| Aggregate expense associated with Manager LTIP, Since inception | 8,600,000 | |||||||||||||||
| Vesting period (years) | 1 year | |||||||||||||||
| Common shares issued in connection with conversion since inception | 8,750 | |||||||||||||||
| Amount transferred from share-based LTIP awards to Shareholders Equity | $ 200,000 | |||||||||||||||
| Common shares issued and outstanding | 20,879,542 | 20,879,542 | 20,879,542 | 16,838,151 | ||||||||||||
| Shareholders' equity per share upon conversion | $ 23.88 | $ 22.32 | $ 23.88 | $ 22.32 | $ 23.88 | $ 22.03 | ||||||||||