Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Stock-based Compensation [Abstract]

Schedule of Stock Options Roll Forward [Table Text Block]

	2012	2011	2010
Number of shares under the plans:
Outstanding and exercisable at beginning of year	39,950	80,950	180,950
Granted	-	-	-
Canceled	-	-	-
Exercised	(17,450)	(41,000)	(100,000)
Outstanding and exercisable at end of year	22,500	39,950	80,950
Number of shares available for future grant:
Beginning of year	315,840	391,881	443,566
End of year	561,655	315,840	391,881

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

	Options Outstanding and Exercisable
	Number	Weighted Average		Weighted
Range of Exercise Prices	of Shares	Remaining Life		Exercise Price
$7.81 - $8.97	10,000	1.9	$	8.39
$9.29 - $14.77	12,500	2.5		12.03
	22,500	2.2	$	10.41

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

					Aggregate
			Grant Date		Fair
Grant Date	Shares		Fair Value		Value	Vesting Date
March 3, 2010	12,185	$	31.92	$	389,000	March 3, 2014
May 28, 2010	2,500		28.07		70,000	February 28, 2012
May 28, 2010	17,500		28.07		491,000	May 28, 2014
October 21, 2010	7,500		31.04		233,000	October 21, 2014
March 15, 2011	24,836		38.46		955,000	March 15, 2015
July 21, 2011	16,600		38.44		638,000	July 21, 2015
August 29, 2011	5,000		24.50		123,000	August 29, 2014
February 1, 2012	66,000		30.15		1,990,000	February 1, 2016
March 6, 2012	18,347		27.49		504,000	March 6, 2016
May 23, 2012	8,000		28.05		224,000	May 23, 2016
December 11, 2012	16,330		41.98		686,000	December 12, 2015

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

						Aggregate
Incentive				Grant Date		Fair
Plan	Grant Date	Units		Fair Value		Value	Vesting Date
2010 - 2012	March 2, 2010	36,541	$	31.83	$	1,163,000	March 2, 2013
2011 - 2013	March 15, 2011	34,002		38.46		1,308,000	March 15, 2014
2012 - 2014	March 6, 2012	43,042		27.49		1,183,000	March 6, 2015

Schedule of Grants, Average Grant Date Fair Value [Table Text Block]

		Average
		Grant date
Incentive Plan		Fair Value	Ten Day Period
2010 - 2012	$	29.39	February 2010
2011 - 2013		40.25	February 2011
2012 - 2014		31.60	February 2012