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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Stock-Based Compensation

Schedule of the assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules

		2013		2012		2011
Risk-free interest rate		1.0%		1.2% - 1.4%		2.4%
Expected dividend yield		0.0%		0.0%		0.0%
Weighted average expected volatility		50%		50%		49%
Expected term		6.0 years		6.0 - 6.3 years		6.0 years
Weighted average grant-date fair value		$11.74		$8.57		$11.88

Schedule of the activity relating to the options outstanding under the Company's plans

		Options			Weighted- Average Exercise Price			Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2011			1,766,253		$	7.18
Granted			90,080		$	24.18
Exercised			(332,099	)	$	4.12
Forfeited			(8,850	)	$	14.89
Expired			(500	)	$	13.00
​	​	​	​	​	​	​	​	​	​	​	​	​
Outstanding at December 31, 2011			1,514,884		$	8.82		5.5 years		$	16,083
​	​	​	​	​	​	​	​	​	​	​	​	​
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
​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​	​
Exercisable at December 31, 2013			899,406		$	10.91		4.1 years		$	12,742
​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​	​

Schedule of other data relating to option activity

(dollars in thousands)		2013			2012			2011
Intrinsic value of options exercised		$	6,878		$	3,421		$	6,637
Fair value of options vested			1,047			725			1,163

Schedule of information with respect to stock options outstanding and exercisable

The following table summarizes information with respect to stock options outstanding and exercisable under the Company's plans at December 31, 2013:

		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			340,522		$	3.72		2.5 years			340,522		$	3.72
$9.01 - $18.00			586,817		$	14.69		5.3 years			492,929		$	14.16
$18.01 - $24.68			219,981		$	23.92		8.3 years			65,955		$	23.76
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
			1,147,320		$	13.21		5.1 years			899,406		$	10.91
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​

Schedule of restricted stock activity

		Shares			Per Share Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2011			53,945		$	17.15
Granted			65,285		$	24.23
Vested			(11,128	)	$	17.13
Forfeited			(1,264	)	$	17.74
​	​	​	​	​	​	​	​
Outstanding unvested at December 31, 2011			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
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Schedule of performance stock award activity

		Shares			Per Share Weighted- Average Grant Date Fair Value
Outstanding at December 31, 2010			40,256		$	17.18
Granted at target			34,179		$	24.18
​	​	​	​	​	​	​	​
Outstanding at December 31, 2011			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
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

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Tabular disclosure of the amount of cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the tax benefit realized from stock options exercised during the period. Disclosure may also include the intrinsic value of stock options exercised during the period.

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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