Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Change in Contract with Customer, Liability [Roll Forward]
Balance as of the beginning of the period	$ 34,080	$ 31,918
Deferral of revenue during the period	1,049,634	982,647
Less: Revenue recognized during the period	(1,043,967)	(980,485)
Balance as of the end of the period	39,747	34,080
Revenue recognized, recorded in deferred revenue as of prior period	$ 32,700	$ 28,800