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Financial Derivative Instruments - Derivative Position (Details) ¥ in Thousands, gal in Thousands, $ in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 JPY (¥) gal	Dec. 31, 2019 JPY (¥) gal	Mar. 31, 2020 AUD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 AUD ($)	Dec. 31, 2019 USD ($)
Derivatives designated as hedges \| Foreign currency derivatives \| Prepaid expenses and other
Fair Value of Derivatives
Derivative, notional amount	¥ 18,172,950	¥ 19,270,650	$ 45,848		$ 44,468
Gross fair value of assets, current				$ 3,689		$ 3,787
Gross fair value of liabilities, current				(384)		(358)
Net derivative position				3,305		3,429
Derivatives designated as hedges \| Foreign currency derivatives \| Long-term prepayments and other
Fair Value of Derivatives
Derivative, notional amount	5,359,550	5,487,250	7,952		8,429
Gross fair value of assets, noncurrent				1,055		618
Gross fair value of liabilities, noncurrent				(104)		(193)
Net derivative position				951		425
Derivatives not designated as hedges \| Foreign currency derivatives \| Prepaid expenses and other
Fair Value of Derivatives
Gross fair value of assets, current				888
Gross fair value of liabilities, current				(99)
Net derivative position				789
Derivatives not designated as hedges \| Foreign currency derivatives \| Other accrued liabilities
Fair Value of Derivatives
Derivative, notional amount	¥ 987,100	¥ 694,050	$ 2,095		$ 2,438
Gross fair value of assets, current						19
Gross fair value of liabilities, current						(42)
Net derivative position						(23)
Derivatives not designated as hedges \| Fuel derivative contracts \| Prepaid expenses and other
Fair Value of Derivatives
Notional amount (in gallons) \| gal	97,860	97,986
Gross fair value of assets, current				520		5,878
Gross fair value of liabilities, current				0		0
Net derivative position				$ 520		$ 5,878