Segment Reporting (Details 1) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Segment Reporting [Abstract]
Assets, Net	[1]	$ 1,339,442	$ 1,232,153	$ 1,208,875
Cash and cash equivalents		124,075	92,794	$ 70,924
Other assets		244,491	79,030
TOTAL ASSETS		$ 1,708,008	$ 1,403,977

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