Stock Options and Restricted Stock (Tables)

12 Months Ended

Dec. 31, 2015

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

Stock Options Outstanding

The following table summarizes information about the stock options outstanding under the 2005 Incentive Plan at December 31, 2013, 2014 and 2015:

	Shares			Weighted- Average Exercise             Price		Weighted- Average Remaining       Contractual Life       (in years)
Outstanding at January 1, 2013		832,548			10.51		4.6
Granted		—			—		—
Exercised		(256,300	)		9.00		—
Canceled, forfeited, or expired		—			—		—
Outstanding at December 31, 2013		576,248			11.12		3.8
Exercisable at December 31, 2013		557,448			10.91		3.7
Outstanding at January 1, 2014		576,248			11.12		3.8
Granted		—			—		—
Exercised		(294,165	)		9.09		—
Canceled, forfeited, or expired		—			—		—
Outstanding at December 31, 2014		282,083			11.30		3.6
Exercisable at December 31, 2014		282,083			11.30		3.6
Outstanding at January 1, 2015		282,083			11.30		3.6
Granted		—			—		—
Exercised		(193,204	)		9.55		—
Canceled, forfeited, or expired		—			—		—
Outstanding at December 31, 2015		88,879			12.10		4.3
Exercisable at December 31, 2015		88,879			12.10		4.3

Weighted Average Grant Date Fair Values of Options Granted

	2015		2014		2013
	(in thousands)
Cash received from option exercises	$	1,844	$	2,674	$	2,344
Total tax benefits realized for tax deductions from options exercised		2,109		2,797		2,002
Total intrinsic value of options exercised		6,969		9,145		6,654
Grant date fair value of options vested		—		144		226
Aggregate intrinsic value of vested options outstanding		3,448		8,763		17,467

Restricted Stock Outstanding

The following table summarizes information about the restricted stock outstanding under the 2005 Incentive Plan at December 31, 2015:

	Shares			Weighted-Average Grant-Date Fair           Value per Share
Nonvested balance at January 1, 2013		8,000		27.47
Granted		—		—
Vested		(1,600	)	27.47
Forfeited		—		—
Nonvested balance at December 31, 2013		6,400		27.47
Granted		—		—
Vested		(800	)	27.35
Forfeited		(3,200	)	27.59
Nonvested balance at December 31, 2014		2,400		27.35
Granted		—		—
Vested		(800	)	27.35
Forfeited		—		—
Nonvested balance at December 31, 2015		1,600		27.35

	Shares			Weighted-Average Grant-Date Fair           Value per Share
Nonvested balance at January 1, 2012		7,833			26.79
Granted		5,376			33.47
Vested		(7,833	)		26.79
Forfeited		—			—
Nonvested balance at December 31, 2013		5,376			33.47
Granted		5,229			37.27
Vested		(5,376	)		33.47
Forfeited		—			—
Nonvested balance at December 31, 2014		5,229			37.27
Granted		7,112			44.26
Vested		(5,229	)		37.27
Forfeited		—			—
Nonvested balance at December 31, 2015		7,112			44.26

	Shares			Weighted-Average Grant-Date Fair           Value per Share
Nonvested balance at January 1, 2013		2,331			26.79
Granted		80,278			34.14
Vested		—			—
Forfeited		—			—
Nonvested balance at December 31, 2013		82,609			33.93
Granted		4,312			43.83
Vested		(14,000	)		33.58
Forfeited		—			—
Nonvested balance at December 31, 2014		72,921			34.59
Granted		50,461			45.80
Vested		(27,537	)		37.27
Forfeited		(18,317	)		35.48
Nonvested balance at December 31, 2015		77,528			40.57