Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Summary of Reconciliation of Numerators and Denominators Used in Basic and Diluted Per Share Computations

We present below a reconciliation of the numerators and denominators we used in the basic and diluted per share computations for our Class A common stock:

	Year Ended December 31,
(in thousands, except per share amounts)	2017		2016		2015
Basic earnings per share:
Numerator:
Allocation of net income	$	5,879	$	24,885	$	17,155
Denominator:
Weighted-average shares outstanding		21,799		20,917		22,046
Basic earnings per share	$	0.27	$	1.19	$	0.78
Diluted earnings per share:
Numerator:
Allocation of net income	$	5,879	$	24,885	$	17,155
Denominator:
Number of shares used in basic computation		21,799		20,917		22,046
Weighted-average effect of dilutive securities
Add: Director and employee stock options		843		613		348
Number of shares used in per share computations		22,642		21,530		22,394
Diluted earnings per share	$	0.26	$	1.16	$	0.77

We used the following information in the basic and diluted per share computations for our Class B common stock:

	Year Ended December 31,
(in thousands, except per share amounts)	2017		2016		2015
Basic and diluted earnings per share:
Numerator:
Allocation of net income	$	1,237	$	5,916	$	3,835
Denominator:
Weighted-average shares outstanding		5,577		5,577		5,577
Basic and diluted earnings per share	$	0.22	$	1.06	$	0.69