Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The following table summarizes the pre-tax stock-based compensation expense included in reported net income (in thousands):

	Years ended December 31,
	2012		2011		2010
Non-qualified stock options	$	711	$	963	$	794
Restricted stock units		717		650		584
Board of Director stock grants		363		379		279
Total	$	1,791	$	1,992	$	1,657

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Summarized information for our non-qualified stock options is as follows:

						Weighted
						average
				Weighted		remaining		Aggregate
	Number of			average		contractual		intrinsic
Stock Options	options			exercise price		term		value
Outstanding at December 31, 2011		1,441,370		$	9.93
Granted		54,500			17.57
Exercised		(812,340	)		10.80
Forfeited		(37,100	)		11.74
Expired		(21,730	)		4.65
Outstanding at December 31, 2012		624,700		$	9.54		3.37	$	6,942,000
Stock options expected to vest		610,500		$	9.55		3.37	$	6,774,000
Exercisable at December 31, 2012		188,200		$	8.49		2.90	$	2,288,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]

Summarized weighted average information for non-qualified stock options granted to certain key personnel during the years ended December 31, 2012, 2011 and 2010 is as follows:

	2012			2011			2010
Number of options granted		54,500			157,500			500,000
Exercise price	$	17.57		$	13.18		$	7.52
Vesting term		4.5 years			5 years			5 years
Contractual term		5.5 years			6 years			6 years
Grant-date fair value	$	6.80		$	4.63		$	3.15
Black-Scholes assumptions:
Expected term		4.2 years			4.5 years			4.6 years
Expected stock price volatility		48.3	%		39.3	%		47.6	%
Risk-free interest rate		0.61	%		1.82	%		2.15	%
Expected dividend yield		—	%		—	%		—	%

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Summarized share information for our restricted stock units is as follows:

				Weighted
	Year ended			average
	December 31,			grant date
	2012			fair value
	(In shares)			(In dollars)
Outstanding and unvested, beginning of period		102,967		$	6.43
Granted		198,500			19.26
Vested		(85,351	)		6.53
Forfeited		(5,124	)		8.74
Outstanding and unvested, end of period		210,992		$	18.40
Restricted stock units expected to vest		197,232		$	18.49