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Employee Benefit Plans - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
plan
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Expected amortization of actuarial loss from accumulated other comprehensive loss into net periodic benefit costs     $ 4,000    
Estimated future benefit payments expected to be paid in 2018     40,500    
Estimated future benefit payments expected to be paid in 2019     35,600    
Estimated future benefit payments expected to be paid in 2020     36,400    
Estimated future benefit payments expected to be paid in 2021     37,000    
Estimated future benefit payments expected to be paid in 2022     37,500    
Total estimated future benefit payments expected to be paid for the five years ending 2027     $ 193,800    
Target plan asset allocations range     100.00%    
Fixed-income securities          
Defined Benefit Plan Disclosure [Line Items]          
Target plan asset allocations range     45.00%    
Equity and other return-seeking assets          
Defined Benefit Plan Disclosure [Line Items]          
Target plan asset allocations range     55.00%    
Defined benefit plans          
Defined Benefit Plan Disclosure [Line Items]          
Number of plans | plan     2    
Current year actuarial gain (loss)     $ 12,205 $ (9,379) $ 1,026
Curtailments   $ 1,100 0 0 46,793
Defined benefit pension plan, noncash pension settlement charge $ 45,700        
Expected contributions to benefit plans     $ 17,500    
SERPs          
Defined Benefit Plan Disclosure [Line Items]          
Number of plans | plan     2    
Amortization of actuarial loss     $ (200) (200) (200)
Current year actuarial gain (loss)     (2,500) $ 2,300 $ (1,600)
Expected amortization of actuarial loss from accumulated other comprehensive loss into net periodic benefit costs     300    
Expected contributions to benefit plans     $ 6,500