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Basis of Presentation and Summary of Significant Accounting Policies - Carrying Values and Fair Values of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Reported Value Measurement    
Debt Instrument [Line Items]    
Debt instruments, Fair Value $ 9,537,663 $ 10,128,020
Koch Preferred Securities, Fair Value 708,111 682,449
Estimate of Fair Value Measurement    
Debt Instrument [Line Items]    
Debt instruments, Fair Value 9,914,144 10,868,626
Koch Preferred Securities, Fair Value $ 942,500 $ 924,700