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Stock Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2017

Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value

The weighted average grant-date fair value of performance awards granted under the 2006 Plan during 2017, 2016 and 2015 was as follows:



	Years Ended December 31,
	2017		2016		2015
Weighted average grant-date fair value	$	61.94	$	47.93	$	45.54

Performance Award Transactions

Performance award transactions during 2017 were as follows and are presented as if the Company were to achieve its maximum levels of performance under the plan:



Shares awarded but not earned at January 1	1,982,120
Shares awarded	539,598
Shares forfeited or unearned	(876,640	)
Shares earned and vested	—
Shares awarded but not earned at December 31	1,645,078

Restricted Stock Unit Award Transactions

RSU transactions during the year ended December 31, 2017 were as follows:



Shares awarded but not vested at January 1	222,730
Shares awarded	111,166
Shares forfeited	(7,783	)
Shares vested	(88,645	)
Shares awarded but not vested at December 31	237,468

Weighted Average Grant-Date Fair Value Of SSARS And Assumptions Under Black-Scholes Option Model

The weighted average grant-date fair value of SSARs granted under the 2006 Plan and the weighted average assumptions under the Black-Scholes option model were as follows for the years ended December 31, 2017, 2016 and 2015:



	Years Ended December 31,
	2017			2016			2015
Weighted average grant-date fair value	$	11.45		$	7.98		$	7.41
Weighted average assumptions under Black-Scholes option model:
Expected life of awards (years)	3.0			3.0			3.0
Risk-free interest rate	1.5		%	1.1		%	0.9		%
Expected volatility	25.9		%	25.9		%	25.9		%
Expected dividend yield	0.9		%	1.1		%	1.1		%

SSAR Activity

SSAR transactions during the year ended December 31, 2017 were as follows:



SSARs outstanding at January 1		1,458,611
SSARs granted		286,200
SSARs exercised		(670,269	)
SSARs canceled or forfeited		(14,350	)
SSARs outstanding at December 31		1,060,192
SSAR price ranges per share:
Granted	$	63.47-70.41
Exercised		32.01-55.23
Canceled or forfeited		32.01-63.47
Weighted average SSAR exercise prices per share:
Granted	$	63.51
Exercised		52.04
Canceled or forfeited		48.42
Outstanding at December 31		52.48

Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives

The following table sets forth the exercise price range, number of shares, weighted average exercise price, and remaining contractual lives by groups of similar price as of December 31, 2017:



	SSARs Outstanding				SSARs Exercisable
Range of Exercise Prices	Number of Shares	Weighted Average Remaining Contractual Life (Years)	Weighted Average Exercise Price		Exercisable as of December 31, 2017	Weighted Average Exercise Price
$43.39-$52.94	614,600	4.1	$	46.35	248,975	$	47.62
$55.07-$70.41	445,592	5.0	$	60.94	99,067	$	57.11
	1,060,192				348,042	$	50.32