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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The assumptions used for grants in the years ended December 31, 2015, 2014 and 2013 were as follows:

 
2015
 
2014
 
2013
Risk-free interest rate
1.8% -2.0%

 
1.1% -2.6%

 
0.6% – 1.8%

Expected volatility
22.18% - 22.25%

 
18.51% - 22.37%

 
20.05% – 24.08%

Dividend yield
0.0
%
 
0.0
%
 
0.0
%
Expected holding period
7.00 – 10.00 years
 
4.00 – 10.00 years
 
4.00 – 10.00 years

Weighted-average grant date fair value (1)
$6.47 - $8.07

 
$3.28 - $7.32

 
$2.72 – $5.80
Schedule of Share-based Compensation, Stock Options, Activity
A summary of employee stock option transactions follows:

 
Number of
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
(Years)
 
Aggregate
Intrinsic
Value(1)
Outstanding on January 1, 2013
2,645,914

 
$
11.33

 
6.6
 
$
4,371

Granted
868,219

 
$
13.93

 
 
 
 

Exercised
(44,293
)
 
$
12.29

 
 
 
 

Canceled
(15
)
 
$
—

 
 
 
 

Outstanding on December 31, 2013
3,469,825

 
$
11.98

 
6.5
 
$
9,959

Granted
427,219

 
$
17.82

 
 
 
 

Exercised
(442,740
)
 
$
11.41

 
 
 
 

Canceled
(12
)
 
$
—

 
 
 
 

Outstanding on December 31, 2014
3,454,292

 
$
12.77

 
6.4
 
$
25,977

Granted
406,875

 
$
22.00

 
 
 
 

Exercised
(115,531
)
 
$
12.02

 
 
 
 

Canceled
(5
)
 
$
—

 
 
 
 
Outstanding on December 31, 2015
3,745,631

 
$
13.82

 
5.9
 
$
36,612

Options exercisable at:
 

 
 

 
 
 
 

December 31, 2013
1,959,317

 
 

 
 
 
 

December 31, 2014
1,598,885

 
 

 
 
 
 

December 31, 2015
2,035,345

 
 

 
 
 
 

_____________________________
(1)
The aggregate intrinsic value represents the amount by which the fair value of the underlying common stock ($23.59, $20.30 and $14.85 at December 31, 2015, 2014 and 2013, respectively) exceeds the option exercise price.
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
Additional information relating to options outstanding at December 31, 2015 follows:
 
 
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Outstanding
as of
 
Weighted-Average
Remaining
Contractual Life
(Years)
 
Weighted-Average
Exercise Price
 
Exercisable
as of
 
Weighted-Average
Remaining
Contractual Life
(Years)
 
Weighted-Average
Exercise Price
 
Aggregate Intrinsic Value
 
12/31/2015
 
 
 
12/31/2015
 
 
 
$0.00
-
$11.00
 
1,500,905

 
3.9

 
$
10.52

 
1,500,905

 
3.9

 
$
10.52

 
$
—

$11.00
-
$13.20
 
31,906

 
5.1

 
$
12.46

 
23,928

 
5.1

 
$
12.46

 
—

$13.20
-
$15.40
 
1,378,728

 
6.4

 
$
13.78

 
510,512

 
5.0

 
$
13.52

 
—

$15.40
-
$17.60
 
—

 
—

 
$
—

 
—

 
—

 
$
—

 
—

$17.60
-
$19.80
 
427,217

 
8.4

 
$
17.82

 
—

 
—

 
$
—

 
—

$19.80
-
$22.00
 
406,875

 
9.2

 
$
22.00

 
—

 
—

 
$
—

 
—

 
 
 
 
3,745,631

 
5.9

 
$
13.82

 
2,035,345

 
4.2

 
$
11.30

 
$
25,024