Investments - Epic Gas (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	May 31, 2020	May 31, 2019	Dec. 31, 2018	May 31, 2020	May 31, 2019	Feb. 28, 2019
Schedule of Equity Method Investments [Line Items]
Net earnings	$ 128,896	$ 109,819		$ 300,261	$ 156,184
Epic Gas
Schedule of Equity Method Investments [Line Items]
Ownership percentage						21.10%
Proceeds from sale		24,600
Gain from sale		$ 2,800			$ 2,800
Investment						$ 22,100
Epic Gas | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Net earnings			$ 900