Stock Options and Restricted Stock (Tables)

12 Months Ended

Dec. 31, 2012

Stock Options and Restricted Stock [Abstract]

Stock options outstanding

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)
Outstanding at January 1, 2010		1,468,855			10.34		7.4
Granted		—			—		—
Exercised		(153,157	)		9.50		—
Canceled, forfeited, or expired		(45,000	)		—		—
Outstanding at December 31, 2010		1,270,698			10.28		6.4
Exercisable at December 31, 2010		1,118,498			9.49		6.1
Outstanding at January 1, 2011		1,270,698			10.28		6.4
Granted		—			—		—
Exercised		(338,350	)		9.87		—
Canceled, forfeited, or expired		(13,000	)		—		—
Outstanding at December 31, 2011		919,348			10.37		5.5
Exercisable at December 31, 2011		832,948			9.70		5.2
Outstanding at January 1, 2012		919,348			10.37		5.5
Granted		—			—		—
Exercised		(86,800	)		9.00		—
Canceled, forfeited, or expired		—			—		—
Outstanding at December 31, 2012		832,548			10.51		4.6
Exercisable at December 31, 2012		779,948			10.08		4.4

Weighted-average grant date fair values of options granted

	2012		2011		2010
Cash received from option exercises	$	781,000	$	3,339,000	$	1,455,000
Total tax benefits realized for tax deductions from options exercised		405,000		1,025,000		233,000
Total intrinsic value of options exercised		1,468,000		4,240,000		1,238,000
Fair value of shares vested		310,000		315,000		1,245,000
Aggregate intrinsic value of vested shares outstanding		13,393,000		11,288,000		8,961,000

Restricted stock outstanding

	Shares		Weighted-Average Grant-Date Fair Value per Share
Nonvested balance at January 1, 2010		—
Granted		—
Vested		—
Forfeited		—
Nonvested balance at December 31, 2010		—
Granted		—
Vested		—
Forfeited		—
Nonvested balance at December 31, 2011		—
Granted		8,000		27.47
Vested		—
Forfeited		—
Nonvested balance at December 31, 2012		8,000		27.47

	Shares			Weighted-Average Grant-Date Fair Value per Share
Nonvested balance at January 1, 2010		5,844			15.39
Granted		12,246			17.76
Vested		(6,260	)		15.56
Forfeited		—			—
Nonvested balance at December 31, 2010		11,830			17.75
Granted		9,513			22.06
Vested		(11,830	)		17.75
Forfeited		—			—
Nonvested balance at December 31, 2011		9,513			22.06
Granted		7,833			26.79
Vested		(9,513	)		22.06
Forfeited		—			—
Nonvested balance at December 31, 2012		7,833			26.79

	Shares		Weighted-Average Grant-Date Fair Value per Share
Nonvested balance at December 31, 2011		—		—
Granted		2,331		26.79
Vested		—		—
Forfeited		—		—
Nonvested balance at December 31, 2012		2,331		26.79