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Employee Benefit Plans - Components of Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 5,716 $ 5,909 $ 13,355 $ 17,837
Pension and Other Postretirement Benefit Expense, Discontinued Operations 132 179 509 547
Pension and Other Postretirement Benefit Expense, Continuing Operations 5,584 5,730 12,846 17,290
Defined contribution plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 2,137 2,300 6,908 7,161
Multi-employer plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 50 58 141 191
Defined benefit plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost 5,962 6,504 17,812 19,475
Expected return on plan assets, net of expenses (5,734) (4,360) (17,199) (13,079)
Amortization of actuarial loss 1,026 1,150 2,867 3,318
Total for defined benefit pension plans 1,254 3,294 3,480 9,714
SERPs        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 2,275 $ 257 $ 2,826 $ 771