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Business Segments and Geographic Information (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($) | Dec. 31, 2016 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 | $ 1,487 | $ 1,119 |
Investment in subsidiary | $ 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 | $ 1,100 | $ 900 |
Investment in Joint Ventures | $ 10,900 |  | 11,800
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 | $ 300 |  |
Investment in subsidiary | $ 1,700 |  | $ 1,300

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