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Tealstone Acquisition - Consideration Transfered and Purchase Price Allocation (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 03, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Combination, Consideration Transferred [Abstract] |  |  |  |
Common stock (1,882,058 shares) |  | $ 17,061 | $ 0 | $ 0
Shares issued in acquisition of business (in shares) |  | 1,882,058 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |  |
Goodwill |  | $ 85,231 | $ 54,820 |
Tealstone |  |  |  |
Business Combination, Consideration Transferred [Abstract] |  |  |  |
Cash, net of cash acquired | $ 54,861 |  |  |
Common stock (1,882,058 shares) | 17,061 |  |  |
Promissory notes | 4,436 |  |  |
Deferred payments | 7,153 |  |  |
Total | $ 83,511 |  |  |
Shares issued in acquisition of business (in shares) | 1,882,058 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |  |
Accounts receivable | $ 19,876 |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 2,944 |  |  |
Inventory | 1,218 |  |  |
Other current assets | 54 |  |  |
Property, plant and equipment | 565 |  |  |
Other assets, net | 1 |  |  |
Identifiable intangible assets | 46,617 |  |  |
Goodwill | 30,411 |  |  |
Accounts payable | (16,781) |  |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | (303) |  |  |
Accrued expenses | (823) |  |  |
State income tax payable | (268) |  |  |
Total Consideration | $ 83,511 |  |  |

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