Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Significant Accounting Policies [Abstract]

Components of allowance for doubtful accounts

The following table represents a rollforward of the allowance for doubtful accounts for the years ended December 31, 2015, 2014 and 2013:

	Year Ended December 31
	2015			2014			2013
Allowance balance, beginning of year	$	2,248		$	1,708		$	2,143
Provision		18			1,011			629
Write offs		(357	)		(465	)		(1,042	)
Other		(72	)		(6	)		(22	)
Allowance balance, end of year	$	1,837		$	2,248		$	1,708

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 per share:

	Year Ended December 31
	2015		2014		2013
Denominator:
Denominator for basic earnings per share		22,934		22,819		22,749
Effect of dilutive securities:
Employee stock options and restricted stock units		123		176		218
Supplemental executive retirement plan		63		110		114
Denominator for diluted earnings per share		23,120		23,105		23,081