Accrued Expenses and Other Current Liabilities (Tables)

3 Months Ended

Mar. 31, 2022

Accrued Expenses and Other Current Liabilities [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

(in US$ thousands)	March 31, 2022		December 31, 2021
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