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Business Segments and Geographic Information - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
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 $ 2,735 $ 1,342 $ 7,071 $ 4,255  
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 2,200 1,100 $ 5,900 3,400  
Investment in joint venture 12,800   $ 12,800   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 600 $ 200 $ 1,200 $ 800  
Investment in affiliate $ 3,900   $ 3,900   $ 2,700