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Business Combinations - Energy Segment (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]  
Seller note $ 388,702
Energy  
Business Acquisition [Line Items]  
Consideration paid 42,100
Cash 39,200
Energy | Customer contracts  
Business Acquisition [Line Items]  
Fair Value $ 5,000
Minimum | Energy | Customer contracts  
Business Acquisition [Line Items]  
Amortization period 4 years
Maximum | Energy | Customer contracts  
Business Acquisition [Line Items]  
Amortization period 15 years
Medium-term Notes | Seller Note Due 2022, 4.25% | Energy  
Business Acquisition [Line Items]  
Seller note $ 2,900
Interest rate (as a percent) 4.25%