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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Anticipated expenditures relating to completion of construction type contracts | $ 128.8 |
Rental expense | 0.6 | 0.7
Minimum annual rental commitments, remainder 2012 | 1.8 |
Minimum annual rental commitments, 2013 | 2.4 |
Minimum annual rental commitments, 2014 | 2.2 |
Minimum annual rental commitments, 2015 | 1.4 |
Minimum annual rental commitments, 2016 | 0.2 |
Minimum annual rental commitments, thereafter | $ 0.7 |
Maximum [Member] | Partnership Interest [Member] |  |
Less than joint venture economic interest noted | 100.00% |

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