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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2017:
 
 
Options Outstanding and Exercisable (1)
Exercise Prices
 
Number
 
Weighted
Average Price
$30.06
 
26,114

 
$
30.06

$75.17
 
26,752

 
75.17

$80.89 - $85.05
 
27,476

 
82.84

Total options
 
80,342

 
$
63.13

 

(1)
The aggregate intrinsic value of options outstanding and exercisable at September 30, 2017 was $2.3 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $91.45 per share on September 30, 2017 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 nine months ended September 30, 2017:
 
Nine Months Ended
September 30, 2017
Weighted average fair value of options granted
5.25
Expected volatility
18.9%
Risk-free interest rate
1.3%
Expected dividend yield
5.5%
Expected life
2 years
Summary of Share Incentive Plans
The following table summarizes activity under our share incentive plans for the nine months ended September 30, 2017:
 
 
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, 2016
105,066

 
$
48.27

 
604,487

 
$
71.03

Granted
14,622

 
80.89

 
225,496

 
83.41

Exercised/Vested
(39,346
)
 
30.06

 
(319,823
)
 
72.26

Forfeited
—

 
—

 
(8,876
)
 
74.73

Total options and nonvested share awards outstanding at September 30, 2017
80,342

 
$
63.13

 
501,284

 
$
75.77
Summary of non-qualified deferred compensation share award activity
The following table summarizes the eligible share award activity for the nine months ended September 30, 2017:
(in thousands)
 
Nine Months Ended
September 30, 2017
Temporary equity:
 
 
Balance at December 31, 2016
 
$
77,037

Change in classification
 
10,690

Change in redemption value
 
8,469

Diversification of share awards
 
(23,181
)
Balance at September 30, 2017
 
$
73,015