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Commitments and Contingencies - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
employee
collective_bargaining_agreement
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]      
Number of collective bargaining agreements that are national or regional in scope | collective_bargaining_agreement 2    
Restructuring expenses $ 1,523 $ 2,306 $ 1,577
Restructuring reserve $ 1,558 1,630 492
Minimum      
Loss Contingencies [Line Items]      
Number of employees | employee 36,000    
Number of collective bargaining agreements between our individual subsidiaries and local unions | collective_bargaining_agreement 400    
Surety Bond [Member]      
Loss Contingencies [Line Items]      
Aggregate estimated exposure $ 1,200,000    
Employee Severance [Member]      
Loss Contingencies [Line Items]      
Restructuring expenses $ 1,500 $ 2,300 $ 1,600
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member]      
Loss Contingencies [Line Items]      
Percentage of employees represented by unions 59.00%