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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Summary of Stock Option Activity under Plan
The following table summarizes stock option activity under the Plan for the nine months ended September 30, 2015 and 2014:
 
Shares
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual Life
(in years)
 
Aggregate
Intrinsic Value (1)
(in thousands)
Options outstanding at January 1, 2014
1,190,000

 
$
15.48

 
9.3
 
$
862

Granted
1,220,000

 
16.74

 
 
 
 

Exercised
(28,750
)
 
15.00

 
 
 
74

Forfeited
(216,250
)
 
15.70

 
 
 
 

Options outstanding at September 30, 2014
2,165,000

 
$
16.17

 
9.3
 
$
3,438

Options exercisable at September 30, 2014
131,250

 
$
15.00

 
8.4
 
$
362

 
 
 
 
 
 
 
 
Options outstanding at January 1, 2015
2,165,000

 
$
16.17

 
8.8
 
$
1,890

Granted
588,500

 
16.49

 
 
 
 

Exercised
(15,000
)
 
15.00

 
 
 
19

Forfeited
(178,500
)
 
16.57

 
 
 
 

Options outstanding at September 30, 2015
2,560,000

 
$
16.23

 
8.3
 
$
557

Options exercisable at September 30, 2015
636,250

 
$
15.94

 
7.7
 
$
273


(1)
Intrinsic value for activities other than exercises is defined as the difference between the grant price and the market value on the last trading day of the period for those stock options where the market value is greater than the exercise price. For exercises, intrinsic value is defined as the difference between the grant price and the market value on the date of exercise.
Summary of Black-Scholes Option Pricing Model Inputs used for Valuation of Stock Options Outstanding
The following table summarizes the Black-Scholes Option Pricing Model inputs used for valuation of the stock options for Class A common shares issued during the nine months ended September 30, 2015 and 2014:
 
2015
 
2014
Weighted-average fair value
$
4.57

 
 
$
4.89

 
Expected term (years)
7.0

 
 
7.0

 
Dividend yield
3.0

%
 
3.0

%
Volatility
35.9

%
 
37.3

%
Risk-free interest rate
1.9

%
 
2.2

%
Summary of Restricted Stock Units Activity Under Plan
The following table summarizes the activity that relates to the Company’s restricted stock units under the Plan for the nine months ended September 30, 2015 and 2014:
 
2015
 
2014
Restricted stock units at beginning of period
85,000

 
—

Units awarded
44,000

 
92,000

Units vested
(22,000
)
 
—

Units forfeited
(9,700
)
 
(2,000
)
Restricted stock units at end of the period
97,300


90,000