Business Segments and Geographic Information (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Schedule of Equity Method Investments [Line Items] | |||||
Number of reportable business segment | 4 | ||||
Equity in earnings (losses) of affiliates, net of income tax provision | $ 1,174,000 | $ 1,029,000 | $ 2,658,000 | $ 2,246,000 | |
SACS
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Schedule of Equity Method Investments [Line Items] | |||||
Ownership percentage in Entity | 50.00% | ||||
Equity in earnings (losses) of affiliates, net of income tax provision | 1,200,000 | 1,300,000 | 2,300,000 | 2,500,000 | |
Investment in Joint Ventures | 9,900,000 | 9,900,000 | 8,100,000 | ||
Geo Amey
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Schedule of Equity Method Investments [Line Items] | |||||
Ownership percentage in Entity | 50.00% | ||||
Equity in earnings (losses) of affiliates, net of income tax provision | 100,000 | (200,000) | 300,000 | (300,000) | |
Investment in Joint Ventures | $ (2,600,000) | $ (2,600,000) | $ (3,000,000) |