Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

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

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following summarizes the assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules during the years ended December 31, 2013 and 2012:

	2013		2012
Risk-free interest rate		1.0%		1.2% – 1.4%
Expected dividend yield		0.0%		0.0%
Weighted average expected volatility		50%		50%
Expected term		6.0 years		6.0 – 6.3 years
Weighted average grant-date fair value	$	11.74	$	8.57

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

Following is a summary of stock option activity for the three-year period ending December 31, 2014:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2012		1,514,884		$	8.82
Granted		169,088		$	17.76
Exercised		(245,054	)	$	5.78
Forfeited		(4,680	)	$	19.19
Expired		(2,010	)	$	18.85
Outstanding at December 31, 2012		1,432,228		$	10.34		5.1 years	$	17,220
Granted		111,147		$	24.68
Exercised		(390,652	)	$	5.90
Forfeited		(4,003	)	$	20.28
Expired		(1,400	)	$	15.96
Outstanding at December 31, 2013		1,147,320		$	13.21		5.1 years	$	13,623
Exercised		(134,273	)	$	7.93
Forfeited		(2,838	)	$	22.66
Expired		(1,428	)	$	24.26
Outstanding at December 31, 2014		1,008,781		$	13.87		4.2 years	$	13,652
Exercisable at December 31, 2014		879,024		$	12.72		3.6 years	$	12,905

Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]

Other data relating to option activity for the years ended December 31 are as follows:

(dollars in thousands)	2014		2013		2012
Intrinsic value of options exercised	$	2,383	$	6,878	$	3,421
Fair value of options vested		1,187		1,047		725

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following table summarizes information with respect to stock options outstanding and exercisable under the Company’s plans at December 31, 2014:

	Options Outstanding						Options Exercisable
Exercise Price Ranges	Number Of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Number Of Options		Weighted- Average Exercise Price
$3.65 – $9.00		248,861	$	3.73		1.5 years		248,861	$	3.73
$9.01 – $18.00		551,740	$	14.66		4.2 years		505,564	$	14.40
$18.01 – $24.68		208,180	$	23.90		7.3 years		124,599	$	23.87
		1,008,781	$	13.87		4.2 years		879,024	$	12.72

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

Following is a summary of restricted stock activity for the three-year period ending December 31, 2014:

	Shares			Per Share Weighted- Average Grant Date Fair Value
Outstanding unvested at January 1, 2012		106,838		$	21.47
Granted		106,289		$	17.95
Vested		(25,248	)	$	21.07
Forfeited		(2,115	)	$	18.91
Outstanding unvested at December 31, 2012		185,764		$	19.54
Granted		76,590		$	24.48
Vested		(48,513	)	$	19.50
Forfeited		(2,125	)	$	20.03
Outstanding unvested at December 31, 2013		211,716		$	21.33
Granted		82,351		$	24.46
Vested		(64,657	)	$	20.85
Forfeited		(9,073	)	$	21.34
Outstanding unvested at December 31, 2014		220,337		$	22.64

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

Following is a summary of performance stock award activity for the three-year period ending December 31, 2014:

	Shares			Per Share Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2012		74,435		$	20.39
Granted at target		41,755		$	17.48
Forfeited for performance below target		(9,401	)	$	17.18
Vested		(30,855	)	$	17.18
Forfeited		(1,011	)	$	19.76
Outstanding at December 31, 2012		74,923		$	20.51
Granted at target		46,106		$	24.68
Earned for performance above target		11,281		$	24.18
Vested		(45,116	)	$	24.18
Outstanding at December 31, 2013		87,194		$	21.29
Granted at target		85,078		$	27.69
Earned for performance above target		25,292		$	17.48
Vested		(65,237	)	$	17.48
Forfeited		(5,524	)	$	24.84
Outstanding at December 31, 2014		126,803		$	26.63

Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]

The following summarizes outstanding performance shares awarded at target by performance measures as of December 31, 2014.

	Performance Shares
Shares with ROE measures		44,757
Shares with ROIC measures		41,023
Shares with TSR measures		41,023
		126,803