Leases - Other additional information related to operating lease liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows	$ 75,097	$ 69,075
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	$ 441,653	$ 11,262
Weighted average remaining lease term	6 years	13 years
Weighted average discount rate	1.69%	3.71%