Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Options, Valuation Assumptions

The fair value of each option grant was established at the date of grant using the Black-Scholes option pricing model. The Company used the following assumptions:

	Years Ended December 31,
	2014		2013		2012
Weighted-average risk-free interest rates	2.0	%	1.4	%	1.7	%
Expected dividend yields	—	%	—	%	—	%
Volatility factors of expected market price of Company's common stock	34	%	41	%	48	%
Assumed forfeiture rates	10.3	%	11.2	%	9.0	%
Weighted-average expected terms of options, in years	7.2		7.5		7.5
Options vesting annually	25.0	%	25.0	%	25.0	%

Schedule of Stock-based Compensation Expense and Related Tax Benefit

The following table details the Company's stock-based compensation expense and related tax benefit associated with this expense:

	Years Ended December 31,
(in thousands)	2014		2013		2012
Stock-based compensation expense	$	811	$	948	$	1,082
Tax benefit associated with compensation expense	173		169		171

Stock Options, Activity

Combined stock option transactions under both Plans were as follows: 

	Years Ended December 31,
	2014				2013				2012
	Options		Weighted Avg. Exercise Price		Options		Weighted Avg. Exercise Price		Options		Weighted Avg. Exercise Price
Outstanding at beginning of year	1,266,338		$	19.17	1,273,731		$	19.21	1,076,067		$	20.86
Granted	116,990		19.57		126,571		16.55		241,575		11.50
Exercised	(76,321	)	13.50		(25,105	)	13.17		—		—
Forfeited/expired	(126,253	)	23.18		(108,859	)	18.05		(43,911	)	17.25
Outstanding at end of year	1,180,754		$	19.14	1,266,338		$	19.17	1,273,731		$	19.21
Exercisable at December 31	844,950		$	20.64	843,011		$	22.18	789,129		$	23.58
Options available for grant at December 31	147,275				226,899				327,184
Weighted-average fair value of options   granted during the year			$	7.72			$	7.55			$	5.99

Shares Authorized under Stock Option Plans, by Exercise Price Range

Exercise prices for options outstanding as of December 31, 2014 are presented in the following table: 

	Options Outstanding	Weighted Avg. Exercise  Price		Weighted Avg. Remaining Contractual Life	Options Exercisable	Weighted Avg. Exercise Price
Options with exercise prices ranging from     $8.46 to $13.20	476,477	$	11.88	6.4 years	328,116	$	11.97
Options with exercise prices ranging from     $13.21 to $25.21	323,822	17.48		7.2 years	136,379	16.42
Options with exercise prices ranging from     $25.22 to $33.50	380,455	29.63		1.8 years	380,455	29.63
Total options outstanding with exercise     prices ranging from $8.46 to $33.50	1,180,754	$	19.14	5.1 years	844,950	$	20.64

Schedule of Nonvested Share Activity

The following table represents nonvested options: 

		Number of Shares		Weighted Avg. Grant Date Fair Value
Nonvested options,	December 31, 2013	423,327		$	6.59
Granted		116,990		7.72
Vested		(178,135	)	6.60
Forfeited		(26,378	)	6.56
Nonvested options,	December 31, 2014	335,804		$	6.98