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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014 were as follows:

 
2016
 
2015
 
2014
Risk-free interest rate
1.5% -1.7%

 
1.8% -2.0%

 
1.1% -2.6%

Expected volatility
16.49% - 18.13%

 
22.18% - 22.25%

 
18.51% - 22.37%

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

Weighted-average grant date fair value (1)
$5.09 - $6.88

 
$6.47 - $8.07

 
$3.28 - $7.32


(1) Per share amounts have not been adjusted to give effect to the stock dividends in 2016, 2015 and 2014.
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, 2014
3,643,316

 
$
11.41

 
6.5
 
$
9,959

Granted
448,580

 
$
16.97

 
 
 
 

Exercised
(464,877
)
 
$
10.87

 
 
 
 

Canceled
(13
)
 
$
—

 
 
 
 

Outstanding on December 31, 2014
3,627,006

 
$
12.16

 
6.4
 
$
25,977

Granted
427,219

 
$
20.95

 
 
 
 

Exercised
(121,308
)
 
$
11.45

 
 
 
 

Canceled
(5
)
 
$
—

 
 
 
 

Outstanding on December 31, 2015
3,932,912

 
$
13.16

 
5.9
 
$
36,612

Granted
406,875

 
$
22.13

 
 
 
 

Exercised
(33,501
)
 
$
11.87

 
 
 
 

Canceled
(6
)
 
$
—

 
 
 
 
Outstanding on December 31, 2016
4,306,280

 
$
14.02

 
5.3
 
$
37,557

Options exercisable at:
 

 
 

 
 
 
 

December 31, 2014
1,678,829

 
 

 
 
 
 

December 31, 2015
2,137,112

 
 

 
 
 
 

December 31, 2016
2,111,985

 
 

 
 
 
 

_____________________________
(1)
The aggregate intrinsic value represents the amount by which the fair value of the underlying common stock ($22.74, $22.47 and $19.33 at December 31, 2016, 2015 and 2014, 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, 2016 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
 
12/31/2016
 
 
 
12/31/2016
 
 
 
$8.85
-
$11.07
 
1,575,948

 
2.9

 
$
10.02

 
1,575,948

 
2.9

 
$
10.02

 
$
—

$11.07
-
$13.28
 
1,447,663

 
5.4

 
$
13.13

 
536,037

 
4.0

 
$
12.88

 
—

$13.28
-
$15.49
 
—

 
—

 
$
—

 
—

 
—

 
$
—

 
—

$15.49
-
$17.70
 
448,577

 
7.4

 
$
16.98

 
—

 
—

 
$
—

 
—

$17.70
-
$19.92
 
—

 
—

 
$
—

 
—

 
—

 
$
—

 
—

$19.92
-
$22.13
 
834,092

 
8.6

 
$
21.53

 
—

 
—

 
$
—

 
—

 
 
 
 
4,306,280

 
5.3

 
$
14.02

 
2,111,985

 
3.2

 
$
10.81

 
$
25,331