Schedule II - Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Movement in Valuation Allowances and Reserves

			Additions		Deductions
	Balance at Beginning of Year		Charged to Operations		Credited to Operations		Written Off			Balance at End of Year
Allowance for Doubtful Accounts Receivable:
2019	$	1,601	$	323	$	—	$	(293	)	$	1,631
2018	$	1,300	$	768	$	—	$	(467	)	$	1,601
2017	$	1,810	$	662	$	—	$	(1,172	)	$	1,300