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Pension and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2008
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Pension obligations   $ 27,407 $ 26,821  
Pension Benefits        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Actuarial (loss) gain, net   (47,632) 18,529  
Net benefit obligation   125,172 115,761  
Pension obligations   42,000 40,000  
Pension Benefits | Other noncurrent liabilities        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Net benefit obligation   $ (125,000) (116,000)  
401(k) Plan        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Percent match of contribution plan   100.00%    
Percentage of eligible compensation of contribution plan   6.00%    
Expenses recognized related to the 401(k) Plan   $ 23,000 22,000 $ 25,000
LLP        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Decrease in projected benefit obligation $ 34,000      
Benefit obligation amortization period 23 years 6 months      
Contribution to pension plan   $ 2,000 $ 20,000  
Defined benefit plan percentage of funded status   80.00%    
Estimated contributions in 2020   $ 17,000    
LLP | Sale of Stock        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   40.00%    
LLP | Fixed income securities        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   15.00%    
LLP | Money market mutual fund        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   15.00%    
LLP | Real Estate        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   30.00%