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Employee Benefit Plans - Schedule of Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined benefit plans      
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year $ 625,535 $ 611,257  
Interest cost 25,966 27,359 $ 30,477
Benefits paid (34,997) (33,571)  
Actuarial (gains)/losses 38,032 20,490  
Projected benefit obligation at end of year 654,536 625,535 611,257
Plan assets:      
Fair value at beginning of year 412,459 407,797  
Actual return on plan assets 67,676 29,577  
Company contributions 19,303 8,656  
Benefits paid (34,997) (33,571)  
Fair value at end of year 464,441 412,459 407,797
Funded status (190,095) (213,076)  
Amounts Recognized in Consolidated Balance Sheets:      
Current liabilities 0 0  
Noncurrent liabilities (190,095) (213,076)  
Total (190,095) (213,076)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Unrecognized net actuarial loss recognized in accumulated other comprehensive loss 127,666 144,294  
SERPs      
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 21,260 19,800  
Interest cost 869 910  
Benefits paid (948) (1,030)  
Actuarial (gains)/losses 2,510 1,580  
Projected benefit obligation at end of year 23,691 21,260 19,800
Plan assets:      
Fair value at beginning of year 0 0  
Actual return on plan assets 0 0  
Company contributions 948 1,030  
Benefits paid (948) (1,030)  
Fair value at end of year 0 0 $ 0
Funded status (23,691) (21,260)  
Amounts Recognized in Consolidated Balance Sheets:      
Current liabilities (6,380) (1,548)  
Noncurrent liabilities (17,311) (19,712)  
Total (23,691) (21,260)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Unrecognized net actuarial loss recognized in accumulated other comprehensive loss $ 8,667 $ 6,342