Income Taxes (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits
Balance at the beginning of the period	$ 115,653	$ 23,482	$ 22,652
Tax positions related to current year:
Additions	18,600	16,485	1,032
Tax positions related to prior years:
Additions	0	76,158	115
Reductions	(209)	(472)	(317)
Settlements	0	0	0
Balance at the end of the period	$ 134,044	$ 115,653	$ 23,482