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Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Chairman and Chief Executive Officer |  |  |  |
Related party transactions |  |  |  |
Monthly payments under non-cancelable operating lease agreements |  |  | $ 0.2 |
Percentage increase per annum in monthly lease payments under non-cancelable operating lease agreements |  |  | 3.00% |
Lease expense under non-cancelable operating lease agreements | 0.6 | 0.6 | 1.2 | 1.2
O&G |  |  |  |
Related party transactions |  |  |  |
Ownership percentage in joint venture |  |  | 30.00% |
Estimated total contract value | $ 363 |  | $ 363 |
Number of Company's shares of common stock held by related party joint venture partner (in shares) | 600,000 | 600,000 | 600,000 | 600,000
Percentage of common stock held by related party | 1.25% | 1.26% | 1.25% | 1.26%

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- Definition Number of Company's shares of common stock held by a related party joint venture partner. + References No definition available. + Details
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- Definition Represents the monthly lease payment under non-cancelable operating leases. + References No definition available. + Details
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- Definition Percentage represents the Company's ownership percentage in the joint venture. + References No definition available. + Details
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- Definition Percentage increase per annum in the monthly payments under non-cancelable operating lease agreements with the Company's chairman and chief executive officer and an affiliate owned by the Company's chairman and chief executive office, beginning August 1, 2009 and expiring on July 31, 2016. + References No definition available. + Details
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- Definition Related party's cumulative holdings, in percentage, of the entity's stock on the date of balance sheet. + References No definition available. + Details
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- Definition Represents the amount of the estimated contract value related to the highway construction project. + References No definition available. + Details
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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
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- Details
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