Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Allowance as of the beginning of the year		$ 11,387	$ 2,419	$ 5,233
Additions expensed during the year	[1]	9,279	11,280	460
Net deductions	[2]	(10,201)	(2,312)	(3,274)
Allowance as of the end of the year		$ 10,465	$ 11,387	$ 2,419

[1] Increases in 2021 and 2020 related to COVID-19 bad debt expense in excess of the amount recovered through rates.

[2] Increase in 2021 relates to COVID forgiveness program.