Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 70,327	$ 74,388	$ 49,331
Additions for tax positions taken in the current year	5,149	4,450	5,279
Additions for tax positions of prior years	12,679	2,612	21,669
Additions for tax positions from acquisitions	1,294	0	0
Reductions for tax positions of prior years	(19,611)	(5,831)	0
Reductions for tax positions of expired statute of limitations	(1,192)	(3,143)	(1,891)
Settlements	(4,001)	(2,149)	0
Balance at end of year	$ 64,645	$ 70,327	$ 74,388