Segment Reporting (Details 1) - USD ($) $ in Thousands	Sep. 30, 2021		Dec. 31, 2020	Sep. 30, 2020
Segment Reporting [Abstract]
Assets, Net	$ 1,327,344	[1]	$ 1,232,153	$ 1,207,851	[1]
Cash and cash equivalents	85,020		92,794	$ 77,148
Other assets	261,669		79,030
TOTAL ASSETS	$ 1,674,033		$ 1,403,977

[1] Segment assets include receivables, prepaids, inventories, property, plant and equipment, and mineral interests