Rendering

Component: (Network and Table)
Network
2322301 - Disclosure - Share-Based Compensation (Tables)
(http://www.archcapgroup.com/role/ShareBasedCompensationTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000947484 (http://www.sec.gov/CIK)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
 
Valuation assumptions
 
Year Ended December 31,
 
2016
 
2015
 
2014
Dividend yield
0.0
%
 
0.0
%
 
0.0
%
Expected volatility
21.7
%
 
22.1
%
 
22.8
%
Risk free interest rate
1.4
%
 
1.8
%
 
1.9
%
Expected option life
6.0 years

 
6.0 years

 
6.0 years

  
Option activity
A summary of stock option and SAR activity under the Company’s Long Term Incentive and Share Award Plans during 2016 is presented below:
 
Year Ended December 31, 2016
 
Number of
Options / SARs
 
Weighted Average Exercise Price
Outstanding, beginning of year
7,482,462

 
$
38.07

Granted
696,817

 
$
70.55

Exercised
(1,260,856
)
 
$
24.45

Forfeited or expired
(45,929
)
 
$
56.80

Outstanding, end of year
6,872,494

 
$
43.74

Exercisable, end of year
5,015,020

 
$
39.62

  
Unvested restricted share and unit activity
A summary of unvested restricted share and unit activity under the Company’s Long Term Incentive and Share Award Plans for 2016 is presented below:
 
Year Ended December 31, 2016
 
Restricted
Common
Shares
 
Restricted
Unit
Awards
Unvested Shares:
 
 
 
Unvested balance, beginning of year
1,800,593

 
264,629

Granted
417,956

 
63,024

Vested
(541,409
)
 
(89,054
)
Forfeited
(30,816
)
 
(15,113
)
Unvested balance, end of year
1,646,324

 
223,486

 
 
 
 
Weighted Average Grant Date Fair Value:
 
 
 
Unvested balance, beginning of year
$
51.94

 
$
51.33

Granted
$
71.76

 
$
71.50

Vested
$
57.72

 
$
56.20

Forfeited
$
57.76

 
$
54.84

Unvested balance, end of year
$
54.96

 
$
54.84