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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Pension obligations   $ 27,865 $ 27,407  
Pension Benefits        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Actuarial loss, net   53,831 47,632  
Net benefit obligation   (123,763) (125,172)  
Pension obligations   40,000 42,000  
Pension Benefits | Deferred revenues / other noncurrent liabilities        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Net benefit obligation   $ 124,000 125,000  
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   $ 7,000 23,000 $ 22,000
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   $ 15,000 $ 2,000  
Defined benefit plan percentage of funded status   80.00%    
Estimated contributions in 2020   $ 13,000    
LLP | Global Equities        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   38.00%    
LLP | Real Estate        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   14.00%    
LLP | Money market mutual fund        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   18.00%    
LLP | Liability Heding Assets        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   27.00%    
LLP | Cash        
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]        
Defined benefit plan target allocations percentage   2.00%