Financial Statement Information Investments in Unconsolidated Subsidiaries (Details) $ in Thousands		3 Months Ended					6 Months Ended	9 Months Ended
	Dec. 01, 2016 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 SEK (kr)	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 SEK (kr)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 SEK (kr)	Sep. 30, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Proceeds from (Payments to) Noncontrolling Interests		$ 19,000
Impairment of Long-Lived Assets to be Disposed of		3,601				$ 0	$ (49,000)	$ (44,919)	$ 0
Equity method investments				$ 179,169							$ 144,009
Payments to Acquire Equity Method Investments								6,894	11,066
Equity in (losses) earnings of unconsolidated subsidiaries		(4,232)				20,284		33,745	18,326
Impairment of Mekonomen equity method investment								39,551	22,715
Share Price of the Equity Method Investment | kr					kr 126					kr 83		kr 65
Derivative Asset, Noncurrent				22,636							9,400		$ 29,000
us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarnings		0				2,509		0	2,509
Notes issued in connection with purchase of noncontrolling interest								14,196	0
Noncontrolling Interest, Period Increase (Decrease)		10,000
Adjustments to Additional Paid in Capital, Other		9,000
Mekonomen [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments											115,000
Equity Method Investment, Additional Information	Dec. 01, 2016
Equity Method Investment, Ownership Percentage	26.50%
Payments to Acquire Equity Method Investments	$ 181,000			$ 48,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity											5,000
Proceeds from Equity Method Investment, Distribution					kr 67,000,000	8,000
Impairment of Mekonomen equity method investment			$ 40,000			23,000
Equity Method Investments, Fair Value Disclosure											126,000
Mekonomen [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage				26.60%
Europe [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments				$ 162,765							126,734
Equity in (losses) earnings of unconsolidated subsidiaries		(4,000)				$ 20,000		$ 35,000	$ 18,000
Notes issued in connection with purchase of noncontrolling interest		$ 14,000
North America [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments				$ 16,404							$ 17,275