Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Significant Accounting Policies [Abstract]

Allowance for Doubtful Accounts

The following table represents a rollforward of the allowance for doubtful accounts for the years ended December 31, 2019, 2018 and 2017:

	Year Ended December 31
	2019			2018			2017
Allowance balance, beginning of year	$	1,184		$	1,716		$	1,511
Provision		1,249			223			482
Write offs		(1,016	)		(696	)		(308	)
Other		(1	)		(59	)		31
Allowance balance, end of year	$	1,416		$	1,184		$	1,716

Computation of Earnings Per Share

The following table sets forth a reconciliation of the number of shares used in the computation of basic and diluted earnings (loss) per share:

	Year Ended December 31
	2019		2018		2017
Denominator:
Denominator for basic earnings (loss) per share		22,515		22,902		23,025
Effect of dilutive securities:
Restricted stock units		111		–		96
Supplemental executive retirement plan		48		–		63
Denominator for diluted earnings (loss) per share		22,674		22,902		23,184