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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Stock-Based Compensation

Summary of activity under the entity's stock option plans

		Year Ended December 31,
		2014						2013						2012
Stock Options		Shares			Weighted- Average Exercise Price			Shares			Weighted- Average Exercise Price			Shares			Weighted- Average Exercise Price
Outstanding at beginning of year			858		$	12.24			1,143		$	11.59			1,056		$	10.84
Granted			156		$	16.15			156		$	13.86			190		$	11.19
Exercised			(104	)	$	11.87			(440	)	$	11.10			(103	)	$	3.20
Forfeited			—		$	—			(1	)	$	13.87			—		$	—
Expired			—		$	—			—		$	—			—		$	—
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
Outstanding at end of year			910		$	12.95			858		$	12.24			1,143		$	11.59
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
Options exercisable at end of year			587						528						810

Summary information about stock options outstanding

        The following table summarizes information about stock options outstanding at December 31, 2014 (shares in thousands):

Options Outstanding

Options Exercisable

Range of Exercise Prices

Number Outstanding at 12/31/14

Weighted- Average Remaining Contractual Life

Weighted- Average Exercise Price

Number Exercisable at 12/31/14

Weighted- Average Exercise Price

$6.38 - $7.94

28

0.38

$

6.42

28

$

6.42

$10.73 - $12.90

404

5.31

$

11.57

340

$

11.64

$13.15 - $16.15

478

7.33

$

14.51

219

$

13.65

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$6.38 - $16.15

910

6.22

$

12.95

587

$

12.14

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Schedule of fair values and the assumptions used for the grants

		Year Ended December 31,
		2014			2013			2012
Weighted-average fair value per share of options granted		$	6.24		$	5.06		$	4.03
Fair value assumptions:
Expected dividend yield			1.34	%		1.82	%		1.86	%
Expected stock price volatility			45.2	%		46.6	%		46.5	%
Risk-free interest rate			1.91	%		0.96	%		1.17	%
Expected term			5.6 years			5.6 years			5.3 years

Summary of information about nonvested stock option awards and changes

        The following table summarizes information about nonvested stock option awards as of December 31, 2014 and changes for the year ended December 31, 2014 (shares in thousands):

Stock Options		Shares			Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2013			330		$	4.66
Granted			156		$	6.24
Vested			(163	)	$	4.65
Forfeited			—			—
​	​	​	​	​	​	​	​
Nonvested at December 31, 2014			323		$	5.43
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Summary of activity under the entity's restricted stock plans

        The following table summarizes activity under our restricted stock plans (shares in thousands):

		Shares
Restricted Stock and Restricted Stock Units		2014			2013			2012
Unvested at beginning of year			199			272			302
Granted			133			169			224
Vested			(172	)		(240	)		(254	)
Forfeited			—			(2	)		—
​	​	​	​	​	​	​	​	​	​	​
Unvested at end of year			160			199			272
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

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