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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Number of consolidated projects under construction | 11 |  | 11 |
Anticipated expenditures relating to completion of construction type contracts | $ 418.7 |  | $ 418.7 |
Earnest Money Deposits | 0.9 |  | 0.9 |
Rental expense | 0.8 | $ 0.8 | 1.6 | $ 1.4
Minimum annual rental commitments, remainder of 2015 | 1.0 |  | 1.0 |
Minimum annual rental commitments, 2016 | 2.8 |  | 2.8 |
Minimum annual rental commitments, 2017 | 2.9 |  | 2.9 |
Minimum annual rental commitments, 2018 | 2.7 |  | 2.7 |
Minimum annual rental commitments, 2019 | 2.5 |  | 2.5 |
Minimum annual rental commitments, thereafter | $ 13.6 |  | $ 13.6 |
Maximum [Member] | Partnership Interest [Member] |  |  |  |
Less than joint venture economic interest noted | 100.00% |  | 100.00% |
Non-Refundable [Member] |  |  |  |
Earnest Money Deposits | $ 0.7 |  | $ 0.7 |

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