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Financial Derivative Instruments - Derivative Position (Details) ¥ in Thousands, gal in Thousands, $ in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 JPY (¥) gal	Dec. 31, 2019 JPY (¥) gal	Sep. 30, 2020 AUD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 AUD ($)	Dec. 31, 2019 USD ($)
Derivatives designated as hedges \| Foreign currency derivatives \| Prepaid expenses and other
Fair Value of Derivatives
Gross fair value of assets, current						$ 3,787
Gross fair value of liabilities, current						(358)
Net derivative position						3,429
Derivative, notional amount		¥ 19,270,650			$ 44,468
Derivatives designated as hedges \| Foreign currency derivatives \| Long-term prepayments and other
Fair Value of Derivatives
Gross fair value of assets, noncurrent						618
Gross fair value of liabilities, noncurrent						(193)
Net derivative position						425
Derivative, notional amount		5,487,250			8,429
Derivatives not designated as hedges \| Foreign currency derivatives \| Other accrued liabilities
Fair Value of Derivatives
Gross fair value of assets, current				$ 235		19
Gross fair value of liabilities, current				(625)		(42)
Net derivative position				(390)		(23)
Derivative, notional amount	¥ 4,068,800	¥ 694,050	$ 7,553		$ 2,438
Derivatives not designated as hedges \| Foreign currency derivatives \| Other liabilities and deferred credits
Fair Value of Derivatives
Gross fair value of assets, noncurrent				30
Gross fair value of liabilities, noncurrent				(87)
Net derivative position				(57)
Derivative, notional amount \| ¥	¥ 1,430,750
Derivatives not designated as hedges \| Fuel derivative contracts \| Prepaid expenses and other
Fair Value of Derivatives
Gross fair value of assets, current				39		5,878
Gross fair value of liabilities, current				0		0
Net derivative position				$ 39		$ 5,878
Notional amount (in gallons) \| gal	27,972	97,986