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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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



	2017	2016	2015
Volatility	23% to 26%	22% to 26%	22% to 28%
Risk-free interest rate	1.48% to 1.99%	0.86% to 1.90%	0.99% to 1.60%
Expected life in years	3 to 5	3 to 5	3 to 5
Dividend yield	0.00%	0.00%	0.00%
Weighted average fair value	$8.91	$7.11	$8.81

Schedule Of Share Based Compensation Shares Authorized Under Stock Plans Issued And Avaliability

The following table summarizes the number of shares of common stock authorized for use under the Plan, the number of stock-based awards granted (net of expired or cancelled awards) under the Plan and the number of shares of common stock available for the grant of stock-based awards under the Plan:



Common stock authorized	23,466,000
Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled	(21,818,000	)
Common stock available for grant of stock-based awards as of December 31, 2017	1,648,000

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs



	Years Ended December 31,
	2017		2016		2015
Restricted stock	$	16,616	$	16,494	$	15,543
Stock options	4,231		3,015		3,155
Total	$	20,847	$	19,509	$	18,698

Schedule of Share-based Compensation, Stock Options, Activity

Activity relating to stock options granted under the Company’s plans and outside the plans during the three years ended December 31, 2017 is as follows:

Note H – Stock-Based Compensation (continued)



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2015	3,428,000		$	19.48
Granted	69,000		36.59
Exercised	(1,460,000	)	14.59
Expired/Forfeited	(21,000	)	28.49
Outstanding at December 31, 2015	2,016,000		23.51
Granted	262,000		33.86
Exercised	(746,000	)	14.36
Expired/Forfeited	(33,000	)	30.59
Outstanding at December 31, 2016	1,499,000		29.72
Granted	1,062,000		37.55
Exercised	(655,000	)	24.73
Expired/Forfeited	(9,000	)	35.23
Outstanding at December 31, 2017	1,897,000		$	35.80	4.9 years	$	20,680
Exercisable at December 31, 2017	656,000		$	33.67	3.1 years	$	8,540

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

The following table summarizes information about stock options at December 31, 2017:



	Options Outstanding			Options Exercisable
Range of Exercise Price	Number Outstanding	Weighted Average Remaining Contractual Life (in Years)	Weighted Average Exercise Price	Number Exercisable	Weighted Average Exercise Price
$19.70 to $26.95	9,051	1.2	$22.71	9,056	$22.71
$27.03 to $29.45	80,309	1.8	28.64	80,352	28.64
$30.19 to $33.99	263,045	3.1	31.60	181,717	31.66
$34.06 to $38.05	1,359,071	5.3	36.53	328,974	35.25
$38.96 to $43.30	185,524	6.0	40.11	55,901	39.96
	1,897,000	4.9	$35.80	656,000	$33.67

Schedule of Nonvested Share Activity

The following table summarizes restricted stock activity during the three years ended December 31, 2017:



	Number of Shares		Weighted Average Fair Value at Grant Date
Outstanding at January 1, 2015	4,067,000		$	24.69
Granted	361,000		35.71
Vested	(304,000	)	23.24
Forfeited	(69,000	)	34.23
Outstanding at December 31, 2015	4,055,000		25.32
Granted	434,000		34.30
Vested	(276,000	)	30.28
Forfeited	(22,000	)	33.45
Outstanding at December 31, 2016	4,191,000		25.93
Granted	275,000		37.67
Vested	(508,000	)	30.58
Forfeited	(42,000	)	35.47
Outstanding at December 31, 2017	3,916,000		$	26.05