Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

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, 2012 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	1,459,689		$	35.93
Granted	218,320		61.11
Exercised	(567,381	)	32.63
Expired	(648	)	39.56
Forfeited	(4,569	)	31.56
Outstanding at end of year	1,105,411		$	42.61	2.5	$	36,993
Vested or expected to vest at end of year	1,103,003		$	42.57	2.5	$	36,957
Exercisable at end of year	681,758		$	34.27	1.7	$	28,504

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, 2012, 2011 and 2010 using the Black-Scholes option pricing model:

	2012		2011		2010
Risk-free interest rate	0.52	%	1.05	%	1.25	%
Expected dividend yield	0.00	%	0.00	%	0.00	%
Expected term (in years)	4.0		3.9		3.5
Expected volatility	33	%	35	%	37	%

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

The following table summarizes the Company’s non-vested restricted stock as of December 31, 2012 and changes during the year then ended:

	Shares		Weighted Average Grant Date Fair Value
Non-vested at beginning of year	178,904		$	44.27
Granted	245,355		65.70
Vested	(151,912	)	51.60
Forfeited	(1,623	)	51.18
Non-vested at end of year	270,724		$	59.54

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

The following table summarizes the Company’s non-vested restricted stock units outstanding as of December 31, 2012 and changes during the year then ended:

	Shares		Weighted Average Grant Date Fair Value
Non-vested at beginning of year	15,916		$	47.08
Granted	335,583		67.43
Vested	(53,148	)	64.41
Forfeited	(3,716	)	67.75
Non-vested at end of year	294,635		$	66.86