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Commitments and Contingencies (Details 2) $ in Thousands |  | 6 Months Ended | 44 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 25, 2015 USD ($) | Jun. 30, 2015 USD ($) project | Jun. 30, 2015 USD ($) project | Dec. 31, 2014 USD ($) | May. 31, 2014 USD ($) | Mar. 31, 2013 USD ($) | Nov. 30, 2012 USD ($) | Nov. 30, 2011 USD ($)
Commitments and contingencies |  |  |  |  |  |  |  |
Billings in excess of costs and estimated earnings |  | $ 138,176 | $ 138,176 | $ 158,595 |  |  |  |
Withdrawal liability recorded |  |  |  |  |  |  |  | $ 7,500
Withdrawal liability asserted by the Plan |  |  |  |  | $ 11,700 |  |  |
Monthly payments towards the liability amount |  |  | $ 1,283 |  |  |  |  |
Construction Projects |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |
Number of projects under litigation | project |  | 2 | 2 |  |  |  |  |
Billings in excess of costs and estimated earnings |  | $ 28,000 | $ 28,000 |  |  |  |  |
Construction Project One |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |
Receivable recorded relating to the project |  | 32,900 | 32,900 |  |  |  |  |
Construction Project Two |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |
Receivable recorded relating to the project |  | 17,900 | 17,900 |  |  |  |  |
James Construction Group LLC | North Texas Tollway Authority v. James Construction Group, LLC |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |
Expected cost on settlement | $ 9,000 |  |  |  |  |  |  |
Q3 Contracting |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |
Withdrawal liability recorded |  |  |  |  |  | $ 119 | $ 85 |
Monthly payments towards the liability amount |  | 38 |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |
Total commercial letters of credit outstanding |  | 10,622 | 10,622 | 6,864 |  |  |  |
Bonding |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |
Bid and completion bonds issued and outstanding |  | $ 1,523,473 | $ 1,523,473 | $ 1,518,018 |  |  |  |

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