Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

STOCK-BASED COMPENSATION PLANS: [Abstract]

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

A summary of option activity under the Omnibus Plan as of December 31, 2011 and changes during the year then ended is presented below:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at beginning of year	1,801,467		$	31.77
Granted	226,304		55.78
Exercised	(548,359	)	30.56
Expired	(6,350	)	29.41
Forfeited	(13,373	)	35.03
Outstanding at end of year	1,459,689		$	35.93	2.4	$	36,002
Vested or expected to vest at end of year	1,453,897		$	35.86	2.4	$	35,960
Exercisable at end of year	934,204		$	32.67	1.7	$	26,077

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following weighted average assumptions were used to estimate the grant date fair value of options granted during the years ended December 31, 2011, 2010 and 2009 using the Black-Scholes option pricing model:

	2011		2010		2009
Risk-free interest rate	1.05	%	1.25	%	1.62	%
Expected dividend yield	0.00	%	0.00	%	0.00	%
Expected term (in years)	3.90		3.50		3.60
Expected volatility	35	%	37	%	40	%

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table summarizes the Company’s restricted stock as of December 31, 2011 and changes during the year then ended:

	Shares		Weighted Average Grant Date Fair Value
Non-vested at beginning of year	187,436		$	35.31
Granted	77,152		56.03
Vested	(82,345	)	35.08
Forfeited	(3,339	)	39.47
Non-vested at end of year	178,904		$	44.27

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

The following table summarizes the Company’s restricted stock units as of December 31, 2011 and changes during the year then ended:

	Shares		Weighted Average Grant Date Fair Value
Non-vested at beginning of year	13,155		$	36.49
Granted	8,815		56.17
Vested	(4,870	)	36.05
Forfeited	(1,184	)	42.39
Non-vested at end of year	15,916		$	47.08