Commitments and Contingencies (Commitments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount			$ 412,800
total government grant awarded	$ 40,000		40,000		$ 37,400	$ 75,800
Income Tax (Expense) Benefit, Continuing Operations, Government Grants	30,322	$ 21,726	96,626	$ 31,547
unrecognized government grants received	$ 15,000		$ 15,000