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Business Segments and Geographic Information (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of reportable business segments | segment |  |  | 4 |  |
Equity in earnings (losses) of affiliates, net of income tax provision | $ 2,131 | $ 1,124 | $ 3,250 | $ 2,610 |
Investment in subsidiary | 0 |  | $ 0 |  | $ 0
SACS |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage in Entity |  |  | 50.00% |  |
Equity in earnings (losses) of affiliates, net of income tax provision | 900 | 1,100 | $ 1,800 | 2,200 |
Investment in Joint Ventures | 10,900 |  | $ 10,900 |  | 9,000
Geo Amey |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage in Entity |  |  | 50.00% |  |
Equity in earnings (losses) of affiliates, net of income tax provision | 1,100 | $ 100 | $ 1,400 | $ 400 |
Investment in subsidiary | $ 200 |  | $ 200 |  | $ (1,200)

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