Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013 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	1,105,411		$	42.61
Granted	199,209		90.30
Exercised	(319,732	)	35.88
Expired	(521	)	39.08
Forfeited	(15,035	)	63.19
Outstanding at end of year	969,332		$	54.32	2.5	$	40,458
Vested or expected to vest at end of year	967,559		$	54.26	2.5	$	40,440
Exercisable at end of year	569,450		$	40.17	1.6	$	31,822

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, 2013, 2012 and 2011 using the Black-Scholes option pricing model:

	2013		2012		2011
Risk-free interest rate	0.89	%	0.52	%	1.05	%
Expected dividend yield	0	%	0	%	0	%
Expected term (in years)	4.0		4.0		3.9
Expected volatility	29	%	33	%	35	%

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 outstanding as of December 31, 2013 and changes during the year then ended:

	Shares		Weighted Average Grant Date Fair Value
Non-vested at beginning of year	270,724		$	59.54
Granted	55,019		90.12
Vested	(191,910	)	59.05
Forfeited	(7,169	)	64.88
Non-vested at end of year	126,664		$	73.25

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, 2013 and changes during the year then ended:

	Shares		Weighted Average Grant Date Fair Value
Non-vested at beginning of year	294,635		$	66.86
Granted	27,857		89.44
Vested	(213,003	)	66.97
Forfeited	(16,247	)	70.24
Non-vested at end of year	93,242		$	72.78