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Business Segments and Geographic Information - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of reportable business segments | segment |  |  | 4 |  |
Equity in earnings of affiliates, net of income tax provision | $ 2,341 | $ 1,426 | $ 4,336 | $ 2,913 |
Investment in affiliate | 0 |  | $ 0 |  | $ 0
SACS |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage in entity |  |  | 50.00% |  |
Equity in earnings of affiliates, net of income tax provision | 2,100 | 1,200 | $ 3,700 | 2,300 |
Investment in joint venture | 16,000 |  | $ 16,000 |  | 18,100
Geo Amey |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage in entity |  |  | 50.00% |  |
Equity in earnings of affiliates, net of income tax provision | 200 | $ 300 | $ 600 | $ 600 |
Investment in affiliate | $ 3,300 |  | $ 3,300 |  | $ 2,700

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