Schedule II - Consolidated Valuation and Qualifying Accounts Schedule II - Consolidated Valuation and Qualifying Accounts Level 4 (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reserve for uncollectibe accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance		$ 5,263	$ 1,744	$ 1,989
Valuation Allowances and Reserves, Charged to Income		2,083	5,239	2,381
Valuation Allowances and Reserves, Charged (Credited) to Other Accounts		640	438	227
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	2,970	2,158	2,853
Valuation Allowances and Reserves, Ending Balance		5,016	5,263	1,744
Injuries and damages
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance		2,484	1,748	1,877
Valuation Allowances and Reserves, Charged to Income		2,032	1,203	390
Valuation Allowances and Reserves, Charged (Credited) to Other Accounts		0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	736	467	519
Valuation Allowances and Reserves, Ending Balance		$ 3,780	$ 2,484	$ 1,748

[1] Represents deductions from the reserves for purposes for which the reserves were created. In the case of uncollectible accounts, and notes reserves, includes reversals of amounts previously reserved.