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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables)
 6 Months Ended
Jun. 30, 2015
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 June 30, 2015:
 
 
Options Outstanding and Exercisable (1)
Range of Exercise Prices
 
Number
 
Weighted
Average Price
$30.06
 
105,015

 
$
30.06

$41.16 - $43.94
 
119,242

 
42.46

$48.02 - $75.17
 
70,948

 
60.92

Total options
 
295,205

 
$
42.49

 

(1)
The aggregate intrinsic value of options outstanding and exercisable at June 30, 2015 was $9.4 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $74.28 per share on June 30, 2015 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 six months ended June 30, 2015:
 
Six Months Ended
June 30, 2015
Weighted average fair value of options granted
$5.52 - $7.38
Expected volatility
16.5% - 18.8%
Risk-free interest rate
1.0% - 1.3%
Expected dividend yield
3.5% - 3.7%
Expected life
3 years - 4 years
Summary of Share Incentive Plans
The following table summarizes activity under our share incentive plans for the six months ended June 30, 2015:
 
 
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

 
254,974

 
74.51

Exercised/Vested
(53,358
)
 
37.69

 
(299,806
)
 
60.42

Forfeited
—

 
—

 
(6,549
)
 
67.37

Total options and nonvested share awards outstanding at June 30, 2015
295,205

 
$
42.49

 
767,562

 
$
68.21
Summary of non-qualified deferred compensation share award activity
The following table summarizes the eligible share award activity as recorded in temporary equity for the six months ended June 30, 2015:
(in thousands)
 
Six Months Ended
June 30, 2015
Temporary equity:
 
 
Balance at December 31, 2014
 
$
68,134

Change in classification
 
4,678

Change in redemption value
 
(1
)
Diversification of share awards
 
(3,020
)
Balance at June 30, 2015
 
$
69,791