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Share-Based Compensation and Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value
The following table summarizes outstanding share options, all of which were exercisable, at December 31, 2017:
 
 
Options Outstanding and Exercisable (1)
Exercise Prices
 
Number
 
Weighted
Average
Price
$30.06
 
26,114

 
$
30.06

$75.17
 
15,388

 
75.17

$80.89 - $85.05
 
27,476

 
82.84

Total options
 
68,978

 
$
61.15

(1)
The aggregate intrinsic value of options outstanding and exercisable at December 31, 2017 was approximately $2.1 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $92.06 per share on December 31, 2017 and the strike price of the underlying award.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
he following assumptions were used for the reload options granted during the years ended December 31, 2017, 2016 and 2015:
 
 
Year Ended
December 31, 2017
 
Year Ended
December 31, 2016
 
Year Ended
December 31, 2015
Weighted average fair value of options granted
 
$5.25
 
$6.71
 
$5.52 - $7.38
Expected volatility
 
18.9%
 
18%
 
16.5% - 18.8%
Risk-free interest rate
 
1.3%
 
0.9%
 
1.0% - 1.3%
Expected dividend yield
 
5.5%
 
3.8%
 
3.5% - 3.7%
Expected life
 
2 years
 
3 years
 
3 years - 4 years
Summary Of Share Incentive Plans
The following table summarizes activity under our share incentive plans for the three years ended December 31:
 
Options
Outstanding
 
Weighted
Average
Exercise  /
Grant Price
 
Nonvested
Share
Awards
Outstanding
 
Weighted
Average
Exercise  /
Grant Price
Options and nonvested share awards outstanding at December 31, 2014
321,811

 
$
38.97

 
818,943

 
$
63.39

Granted
26,752

 
75.17

 
257,749

 
74.53

Exercised/Vested
(53,358
)
 
37.69

 
(313,628
)
 
61.10

Forfeited
—

 
—

 
(12,818
)
 
67.96

Balance at December 31, 2015
295,205

 
$
42.49

 
750,246

 
$
68.09

Granted
12,854

 
85.05

 
270,978

 
74.92

Exercised/Vested
(202,993
)
 
42.19

 
(398,492
)
 
68.16

Forfeited
—

 
—

 
(18,245
)
 
70.63

Balance at December 31, 2016
105,066

 
$
48.27

 
604,487

 
$
71.03

Granted
14,622

 
80.89

 
226,514

 
83.41

Exercised/Vested
(50,710
)
 
40.17

 
(319,823
)
 
72.26

Forfeited
—

 
—

 
(11,280
)
 
75.37

Total options and nonvested share awards outstanding at December 31, 2017
68,978

 
$
61.15

 
499,898

 
$
75.80
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]
The following table presents information related to our ESPP:
 
2017
 
2016
 
2015
Shares purchased
18,986

 
20,797

 
14,655

Weighted average fair value of shares purchased
$
89.89

 
$
82.33

 
$
74.66

Expense recorded (in millions)
$
0.3

 
$
0.4

 
$
0.2
Temporary Equity [Table Text Block]
The following table summarizes the eligible share award activity for the twelve months ended December 31:
(in thousands)
 
2017
 
2016
Temporary equity:
 
 
 
 
Balance at inception/beginning of period
 
$
77,037

 
$
79,364

Change in classification
 
13,388

 
13,956

Change in redemption value
 
10,038

 
9,145

Diversification of share awards (261 and 297 shares during December 31, 2017 and 2016, respectively)
 
(23,233
)
 
(25,428
)
Balance at December 31
 
$
77,230

 
$
77,037