Capital Stock (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Summary of Restricted Stock Activity

The following table summarizes our restricted stock activity for the three years ended December 31, 2016:

	Shares			Weighted Average Price
Balance at December 28, 2013		109,459		$	24.47
Granted		26,347		$	51.41
Vested		(41,619	)	$	23.44
Cancelled		(21,287	)	$	48.29
Balance at December 27, 2014		72,900		$	27.82
Granted		44,104		$	45.68
Vested		(38,580	)	$	25.24
Cancelled		(35,182	)	$	44.84
Balance at December 26, 2015		43,242		$	34.49
Granted		133,794		$	49.45
Vested		(29,002	)	$	29.74
Cancelled		(2,671	)	$	33.79
Balance at December 31, 2016		145,363		$	49.22

Schedule of Valuation Assumptions Used to Calculate Fair Value of Options Granted

The following table summarizes the valuation assumptions used to calculate the fair value of options granted:

	2016
Expected dividend yield		0	%
Expected stock price volatility		26	%
Risk-free interest rate		0.9	%
Expected life of options		3.0 years

Summary of Stock Option Activity

The following table summarizes our stock option activity for the three years ended December 31, 2016:

	Shares			Option Price per Share		Weighted Average Price		Weighted Average Remaining Terms (years)		Aggregate Intrinsic Value
Balance at December 28, 2013		141,500		$	5.05 – $19.37	$	7.13
Exercised		(66,500	)	$	5.67 – $19.37	$	6.97
Balance at December 27, 2014		75,000		$	5.05 – $19.37	$	7.28
Exercised		(35,000	)	$	5.05 – $19.37	$	7.76
Balance at December 26, 2015		40,000		$	5.67 – $7.74	$	6.86
Granted		61,084		$	41.59 – $53.32	$	44.36
Balance at December 31, 2016		101,084		$	5.67 – $53.32	$	29.52		3.0	$	4,401,521
Options exercisable at December 31, 2016		40,000		$	5.67 – $7.74	$	6.86		1.3	$	2,648,120

Summary of Information Concerning Currently Outstanding and Exercisable Options

The following table summarizes information concerning currently outstanding and exercisable options at December 31, 2016:

	Options Outstanding						Options Exercisable
Range of Exercise Price	Number Outstanding		Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$    5.67		4,000		1.9	$	5.67		4,000	$	5.67
$    6.90		32,000		1.0	$	6.90		32,000	$	6.90
$    7.74		4,000		2.9	$	7.74		4,000	$	7.74
$  41.59		46,684		4.1	$	41.59		—	$	—
$  53.32		14,400		4.4	$	53.32		—	$	—
Balance at December 31, 2016		101,084		3.0	$	29.52		40,000	$	6.86