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Acquisition - Narrative (Details)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jul. 02, 2018
USD ($)
Oct. 28, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
company
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Borrowing From Revolving Credit Facility       $ 47,100    
Revenues       1,531,169    
Other Nonoperating Expense         $ 2,300  
Other Nonoperating Income           $ 1,400
Huen Electric Inc [Member]            
Payments to Acquire Businesses, Net of Cash Acquired $ 47,082   $ 47,082 11,200    
Assets Acquisition, Contingent Consideration Liability     0 0    
Assets Acquisition, Transaction Costs     300 300    
Revenues       69,000    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest       500    
Assets Acquisition, Compensation Expense Associated On Contingent Payments       600    
Assets Acquisition, Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability 1 $ 10,700     $ 11,200    
Number of operating structure | company       3    
Assets Acquisition, Contingent Consideration Arrangements Other Expenses On Contingent Payment     $ 3,900 $ 3,900    
Western Pacific Enterprises [Member]            
Payments to Acquire Businesses, Net of Cash Acquired   $ 12,100        
Assets Acquisition, Contingent Consideration Liability   2,200        
Assets Acquisition, Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability 1   800        
Escrow Deposit   $ 1,900