Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2013

Incentive Compensation Plans [Abstract]

Schedule of Stock Option Activity

	Non-vested
	stock options			Stock options
	outstanding			outstanding
		Weighted-			Weighted-
		average			average
	Number	grant-date		Number	exercise
	of shares	fair value		of shares	price
Balance, January 1, 2011	281,975	$	12.59	605,600	$	22.02
Stock options granted	146,000		21.27	146,000		36.33
Stock options exercised				(27,500)		13.64
Stock options vested	(142,050)		14.78
Stock options forfeited	(1,000)		16.08	(4,000)		32.07
Balance, December 31, 2011	284,925		15.56	720,100		25.19
Stock options granted	40,000		20.60	40,000		36.66
Stock options exercised				(72,050)		18.06
Stock options vested	(125,071)		15.31
Stock options forfeited	(41,000)		16.68	(41,000)		27.84
Balance, December 31, 2012	158,854		18.81	647,050		26.52
Stock options granted	142,000		18.02	142,000		32.72
Stock options exercised				(55,625)		15.25
Stock options vested	(78,958)		18.01
Stock options forfeited	(20,740)		15.87	(26,500)		27.67
Balance, December 31, 2013	201,156	$	18.83	706,925	$	28.61

Schedule of Stock Options, by Exercise Price Range

	Stock options outstanding				Stock options exercisable
		Weighted-
		average
		remaining		Weighted-			Weighted-
		years		average			average
	Number	contractual		exercise	Number		exercise
Range of exercise prices	of shares	life		price	of shares		price
$9.28 to $18.15	119,350	3.2	$	14.45	119,350	$	14.45
$18.49 to $27.29	137,525	5.9		20.91	129,369		20.78
$27.54 to $32.78	183,500	7.9		32.08	68,243		31.85
$33.25 to $35.70	125,000	6.3		34.72	100,278		34.64
$36.15 to $42.50	141,550	7.0		38.13	88,529		38.33
Stock outstanding at end of year	706,925	6.3	$	28.61	505,769	$	26.60
Stock options exercisable at end of year	505,769	5.1

Schedule of Stock Option Valuation Assumptions

	2013	2012	2011
Risk-free interest rate	1.02% to 2.14%	0.80% to 1.10%	1.23% to 2.66%
Dividend yield	0.0%	0.0%	0.0%
Expected market price volatility	57% to 60%	59% to 62%	55% to 62%
Weighted-average expected market price volatility	58.1%	61.8%	56.1%
Expected term	5.4 to 7.5 years	6.0 to 6.3 years	6.0 to 7.9 years