Fair Value of Financial Instruments and Concentrations of Credit Risk - Allowances for Losses on Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 5,024	$ 6,007	$ 10,034
Credit loss expense	664	1,427	1,792
Write-offs, net of recoveries	(1,101)	(3,369)	(5,819)	$ (5,819)
Balance at end of year	4,587	5,024	6,007	10,034
Cumulative effect of accounting change
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 0	959	0
Balance at end of year		$ 0	$ 959	$ 0