Stock Options and Restricted Stock (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Options Outstanding

The following table summarizes information about the stock options outstanding under the 2005 Incentive Plan at December 31, 2014, 2015 and 2016:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)
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
Outstanding at January 1, 2016		88,879			12.10		4.3
Granted		—			—		—
Exercised		(68,879	)		12.14		3.3
Canceled, forfeited, or expired		—			—		—
Outstanding at December 31, 2016		20,000			8.71		3.1
Exercisable at December 31, 2016		20,000			8.71		3.1

Weighted Average Grant Date Fair Values of Options Granted

	2016		2015		2014
	(in thousands)
Cash received from option exercises	$	837	$	1,844	$	2,674
Total tax benefits realized for tax deductions from    options exercised		833		2,109		2,797
Total intrinsic value of options exercised		2,967		6,969		9,145
Grant date fair value of options vested		—		—		144
Aggregate intrinsic value of vested options outstanding		1,073		3,448		8,763

Restricted Stock Outstanding

The following table summarizes information about the restricted stock outstanding under the 2005 Incentive Plan at December 31, 2016:

	Shares			Weighted- Average Grant- Date Fair Value per Share
Nonvested balance at January 1, 2014		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
Granted		—			—
Vested		(800	)		27.35
Forfeited		—			—
Nonvested balance at December 31, 2016		800			27.35

The following table summarizes information about the restricted stock outstanding under the Non-Employee Director Restricted Stock Plan at December 31, 2016:

	Shares			Weighted- Average Grant- Date Fair Value per Share
Nonvested balance at January 1, 2014		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
Granted		5,952			63.57
Vested		(7,488	)		44.54
Forfeited		—			—
Nonvested balance at December 31, 2016		5,576			64.50

The following table summarizes information about the restricted stock outstanding under the 2012 Incentive Plan at December 31, 2016:

	Shares			Weighted- AverageGrant- Date Fair Value per Share
Nonvested balance at January 1, 2014		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
Granted		27,077			54.44
Vested		(26,294	)		45.18
Forfeited		(1,919	)		—
Nonvested balance at December 31, 2016		76,392			43.91