Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) $ in Thousands, $ in Millions	Mar. 31, 2022 AUD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accrued Expenses and Other Current Liabilities [Abstract]
Wages and employee benefits		$ 44,336	$ 41,187
Taxes other than income taxes		7,817	6,246
Accrued royalties		107,144	70,237
Accrued freight costs		35,341	27,754
Accrued mining fees		79,917	65,835
Acquisition related accruals		32,173	31,201
Other liabilities		26,231	28,482
Total accrued expenses and other current liabilities		$ 332,959	270,942
Stamp duty payable	$ 43.0		$ 32,200