Allowance Accounts - Summary Of Activity In Valuation Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Uncollectible Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning of year	$ 0	$ 2,752	$ 1,778
Additions			1,206
Deductions		(2,752)	(232)
Adjustments	0	0	0
Balance at the end of year	0	0	2,752
Deferred Tax Asset Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning of year	17,940	12,337	3,771
Additions			2,788
Deductions		0	0
Adjustments	691	5,603	5,778
Balance at the end of year	$ 18,631	$ 17,940	$ 12,337