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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Anticipated expenditures relating to completion of construction type contracts | $ 102.1 |  | $ 102.1 |
Rental expense | 0.7 | 0.7 | 2.1 | 2.2
Minimum annual rental commitments, remainder 2011 | 0.6 |  | 0.6 |
Minimum annual rental commitments, 2012 | 2.3 |  | 2.3 |
Minimum annual rental commitments, 2013 | 2.2 |  | 2.2 |
Minimum annual rental commitments, 2014 | 2.1 |  | 2.1 |
Minimum annual rental commitments, 2015 | 1.2 |  | 1.2 |
Minimum annual rental commitments, thereafter | $ 0.7 |  | $ 0.7 |
Maximum [Member] | Partnership Interest [Member] |  |  |  |
Less than joint venture economic interest noted | 100.00% |  | 100.00% |

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