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Basis of Presentation - Impact of Topic 326 (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Long-term debt, net   $ 2,874,113  
Deferred income taxes, net (within total liabilities) $ 204,730 220,122 $ 220,122
Additional paid-in capital 830,074 872,711 872,711
Retained earnings $ 1,300,849 1,286,976 $ 1,286,976
Impact of adoption      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Long-term debt, net   52,115  
Deferred income taxes, net (within total liabilities)   (12,109)  
Additional paid-in capital   (41,982)  
Retained earnings   1,976  
As reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Long-term debt, net   2,926,228  
Deferred income taxes, net (within total liabilities)   208,013  
Additional paid-in capital   830,729  
Retained earnings   $ 1,288,952