XML 84 R44.htm IDEA: XBRL DOCUMENT v3.20.2
Basis of Presentation and Summary of Significant Accounting Policies - Carrying Values and Fair Values of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Reported Value Measurement    
Debt Instrument [Line Items]    
Debt instruments, excluding capital lease obligations $ 9,681,495 $ 9,617,491
Estimate of Fair Value Measurement    
Debt Instrument [Line Items]    
Debt instruments, excluding capital lease obligations $ 9,849,485 $ 10,177,751