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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Components of Salaries and Benefits
 
2015
 
2014
 
2013
Salaries and benefits
$
181,416

 
$
154,638

 
$
83,563

Annual incentive compensation
32,030

 
36,482

 
32,107

Share-based compensation under the 2006 Equity Incentive Plan
14,882

 
10,885

 
2,923

Pension plans
10,260

 
9,217

 
6,023

Total salaries and benefits
$
238,588

 
$
211,222

 
$
124,616
Employee Share Awards
The following table summarizes the non-vested share award activity during 2015:
 
Number of
Shares
 
Weighted-
Average
Share Price of
 Award
Nonvested — January 1
101,181

 
$
152.89

Granted
66,238

 
142.50

Vested
(62,996
)
 
143.11

Forfeited
(8,368
)
 
149.73

Nonvested — December 31
96,055

 
150.04
Summary of SARs Activity
The following table summarizes the SAR activity during 2015:
 
Number of
SARs
 
Weighted-
Average
Exercise
Price of SARs
 
Weighted
Average
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic  Value(1)
Balance, beginning of year
1,068,001

 
$
140.53

 
 
 
 
Granted
195,000

 
140.28

 
 
 
 
Exercised
(32,933
)
 
136.16

 
 
 
 
Forfeited
(69,240
)
 
142.19

 
 
 
 
Balance, end of year
1,160,828

 
140.51

 
1.43
 
$
11,063

 _______________________________
(1)
The aggregate intrinsic value is calculated as the pre-tax difference between the exercise price of the underlying share awards and the closing price per share of our ordinary shares of $150.04 on December 31, 2015.
Cash-Settled Stock Appreciation Rights  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used to Estimate Fair Value of SARs Using Black-Scholes Option Valuation Model
The following table sets forth the assumptions used to estimate the fair value of the SARs using the Black-Scholes option valuation model as at December 31, 2015 and 2014:
 
2015
 
2014
Weighted-average fair value per SAR
$
29.02

 
$
37.63

Weighted-average volatility
22.08
%
 
21.24
%
Weighted-average risk-free interest rate
1.29
%
 
0.81
%
Dividend yield
0.00
%
 
0.00
%