Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Transition tax on foreign earnings	$ 303,490	$ 317,745
Wodgina Project acquisition consideration obligation	120,800	0
Operating leases	114,686	0
Liabilities related to uncertain tax positions	21,169	22,877
Executive deferred compensation plan obligation	28,715	26,292
Environmental liabilities	33,058	40,376	$ 37,518
Asset retirement obligations	55,848	41,489
Tax indemnification liability	30,993	45,347
Other	45,777	32,816
Total	$ 754,536	$ 526,942