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Organization, Business and Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2019 USD ($) segment $ / shares | Jun. 30, 2018 USD ($) $ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Number of business segments (segment) | segment |  |  | 2 |
Foreign currency transaction gains (losses) |  |  | $ 100 | $ 0
Revenue recognized related to change orders and claims |  |  | 21,400 | 6,700
Increase (decrease) in operating income | $ 9,410 | $ 10,357 | 19,036 | 18,764
Increase (decrease) in net income | $ 7,207 | $ 6,835 | $ 14,560 | $ 12,479
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ 0.43 | $ 0.41 | $ 0.87 | $ 0.75
Contracts Accounted for under Percentage of Completion [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase (decrease) in consolidated gross margin | (0.90%) | 0.10% | (1.00%) | 0.10%
Increase (decrease) in operating income | $ (4,200) | $ 200 | $ (9,100) | $ 100
Increase (decrease) in net income | $ (1,900) | $ 200 | $ (4,200) | $ 100
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ (0.11) | $ 0.01 | $ (0.25) | $ 0

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