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Share-Based Compensation and Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
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 and exercisable options at December 31, 2014:
 
Options Outstanding and Exercisable (1)
Range of Exercise Prices
Number
 
Weighted
Average
Price
$30.06
135,709

 
$
30.06

$41.16-$43.94
119,242

 
42.46

$48.02-$64.75
66,860

 
50.84

Total options
321,811

 
$
38.97

(1)
The aggregate intrinsic value of options outstanding and exercisable at December 31, 2014 was approximately $11.2 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $73.84 per share on December 31, 2014 and the strike price of the underlying award.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following assumptions were used for the reload options granted during the year ended December 31, 2014:
 
Year Ended
December 31, 2014
Weighted average fair value of options granted
$3.55 - $8.17
Expected volatility
22.6% - 23.2%
Risk-free interest rate
0.1% - 1.1%
Expected dividend yield
3.5%
Expected life
6 months - 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, 2011
1,339,536

 
$
42.27

 
818,754

 
$
46.88

Granted
—

 
—

 
346,330

 
63.51

Exercised/Vested
(468,839
)
 
40.86

 
(282,552
)
 
49.28

Forfeited
(31,943
)
 
60.56

 
(20,279
)
 
52.05

Balance at December 31, 2012
838,754

 
$
42.36

 
862,253

 
$
52.64

Granted
—

 
—

 
350,615

 
69.56

Exercised/Vested
(183,871
)
 
41.56

 
(309,396
)
 
51.41

Forfeited
(20,522
)
 
73.32

 
(72,174
)
 
58.08

Balance at December 31, 2013
634,361

 
$
41.59

 
831,298

 
$
59.77

Granted
84,452

 
64.75

 
314,614

 
65.78

Exercised/Vested
(375,316
)
 
47.85

 
(305,372
)
 
55.97

Forfeited
(21,686
)
 
62.32

 
(21,597
)
 
64.14

Total options and nonvested share awards outstanding at December 31, 2014
321,811

 
$
38.97

 
818,943

 
$
63.39
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]
The following table presents information related to our ESPP:
 
2014
 
2013
 
2012
Shares purchased
25,728

 
17,171

 
20,137

Weighted average fair value of shares purchased
$
71.19

 
$
62.59

 
$
67.80

Expense recorded (in millions)
$
0.5

 
$
0.2

 
$
0.3
Temporary Equity [Table Text Block]
The following tables summarize the eligible share award activity as recorded in temporary equity from July 31, 2013, the effective date of the initial amended and restated plan, through December 31, 2014:
(in thousands)
 
Year Ended
December 31, 2014
 
From July 31, 2013
to December 31, 2013
Temporary equity:
 
 
 
 
Balance at inception/beginning of period
 
$
47,180

 
$
—

Change in classification
 
7,702

 
37,958

Change in redemption value
 
17,921

 
9,575

Diversification of share awards
 
(4,669
)
 
(353
)
Balance at December 31
 
$
68,134

 
$
47,180