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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Asset Retirement Obligation [Line Items]      
Revisions in estimated cash flows   $ 13,244  
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Total asset retirement obligations at December 31, 2019   224,704  
Accretion for the period   14,679  
Sites added during the period   621  
Revisions in estimated cash flows   13,244  
Expenditures for the period   (11,047)  
Total asset retirement obligations at June 30, 2020 $ 242,201 $ 224,704 $ 224,704
Less current portion (2) (35,200)    
Long-term portion 207,001   $ 184,130
Depreciation, Depletion And Amortization      
Asset Retirement Obligation [Line Items]      
Revisions in estimated cash flows 3,100    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Revisions in estimated cash flows $ 3,100