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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014 and 2013 were as follows:

 
2014
 
2013
Risk-free interest rate
1.1% -2.6%

 
0.6% – 1.8%

Expected volatility
18.51% - 22.37%

 
20.05% – 24.08%

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

Weighted-average grant date fair value
$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, 2012
2,544,574

 
$
11.89

 
7.6
 
$
11,187

Granted
—

 
$
—

 
 
 
 

Exercised
(17,727
)
 
$
7.86

 
 
 
 

Canceled
(6,929
)
 
$
13.67

 
 
 
 

Outstanding on December 31, 2012
2,519,918

 
$
11.90

 
6.6
 
$
4,371

Granted
826,875

 
$
14.63

 
 
 
 

Exercised
(42,184
)
 
$
12.90

 
 
 
 

Canceled
(14
)
 
$
—

 
 
 
 

Outstanding on December 31, 2013
3,304,595

 
$
12.58

 
6.5
 
$
9,959

Granted
406,875

 
$
18.71

 
 
 
 

Exercised
(421,657
)
 
$
11.98

 
 
 
 

Canceled
(11
)
 
$
—

 
 
 
 
Outstanding on December 31, 2014
3,289,802

 
$
13.41

 
6.4
 
$
25,977

Options exercisable at:
 

 
 

 
 
 
 

December 31, 2012
439,277

 
 

 
 
 
 

December 31, 2013
1,866,016

 
 

 
 
 
 

December 31, 2014
1,522,748

 
 

 
 
 
 

_____________________________
(1)
The aggregate intrinsic value represents the amount by which the fair value of the underlying common stock ($21.31, $15.59 and $13.49 at December 31, 2014, 2013 and 2012, 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, 2014 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
 
12/31/2014
 
 
 
12/31/2014
 
 
 
$0.00
-
$11.55
 
1,496,029

 
4.8

 
$
11.07

 
1,496,029

 
4.8
 
$
11.07

 
$
—

$11.55
-
$13.86
 
73,822

 
5.4

 
$
12.98

 
26,719

 
5.1
 
$
13.04

 
—

$13.86
-
$16.17
 
1,313,076

 
7.4

 
$
14.47

 
—

 
 
 
$
—

 
—

$16.17
-
$18.48
 
—

 
—

 
$
—

 
—

 
 
 
$
—

 
—

$18.48
-
$20.79
 
406,875

 
9.2

 
$
18.71

 
—

 
 
 
$
—

 
—

$20.79
-
$23.10
 
—

 
—

 
$
—

 
—

 
 
 
$
—

 
—

 
 
 
 
3,289,802

 
6.4

 
$
13.41

 
1,522,748

 
4.8
 
$
11.10

 
$
15,544