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Selected Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 150,021 | $ 165,505 | $ 168,715 | $ 177,418 | $ 195,271 | $ 198,326 | $ 189,111 | $ 169,919 | $ 661,659 | $ 752,627 | $ 697,218
Costs and operating expenses | 138,107 | 151,320 | 156,213 | 161,256 | 180,458 | 181,111 | 172,695 | 158,106 | 606,896 | 692,370 | 644,688
Operating income | 11,914 | 14,185 | (21,910) | 9,734 | 14,813 | 17,215 | 16,416 | 11,813 | 13,923 | 60,257 | 54,230
Net income | $ 6,013 | $ 8,108 | $ (22,624) | $ 3,332 | $ 9,996 | $ 10,527 | $ 9,898 | $ 6,603 | (5,171) | 37,024 | 35,080
Gain on sale of contract |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,700
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.54 | $ 0.73 | $ (2.05) | $ 0.30 | $ 0.92 | $ 0.96 | $ 0.90 | $ 0.60 | $ (0.47) | $ 3.38 | $ 3.23
Basic weighted average shares outstanding (in shares) | 11,052,000 | 11,043,000 | 11,041,000 | 11,000,000 | 10,970,000 | 10,970,000 | 10,970,000 | 10,920,000 | 11,034,256 | 10,957,750 | 10,876,201
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.54 | $ 0.73 | $ (2.05) | $ 0.30 | $ 0.90 | $ 0.95 | $ 0.89 | $ 0.60 | $ (0.47) | $ 3.35 | $ 3.21
Diluted weighted average shares outstanding (in shares) | 11,141,000 | 11,100,000 | 11,041,000 | 11,101,000 | 11,071,000 | 11,060,000 | 11,073,000 | 10,974,000 | 11,034,256 | 11,044,731 | 10,936,057
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on sale of a business entity and certain assets |  |  |  |  |  |  |  |  | $ (8,214) | $ 0 | $ 0
Gain on sale of property |  |  |  |  |  |  |  |  | 1,108 | 0 | 0
Goodwill and intangible asset impairment |  |  |  |  |  |  |  |  | $ 33,734 | $ 0 | $ 0
Miami, Florida |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of property |  |  |  | $ 1,100 |  |  |  |  |  |  |
Prime Turbines |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on sale of a business entity and certain assets |  |  |  | $ (7,500) |  |  |  |  |  |  |
CT Aerospace LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on sale of a business entity and certain assets |  |  | $ (678) |  |  |  |  |  |  |  |
Goodwill and intangible asset impairment |  |  | $ 33,700 |  |  |  |  |  |  |  |

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