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Employee Stock Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of activity regarding active stock option and stock award plans
The following table shows the combined summary of activity regarding active stock option and stock award plans.
 
 
 
Non-Vested Stock Awards Outstanding*
 
Stock Options Outstanding*
 
Shares Available for Grant*
 
Number of Shares
 
Weighted-Average Grant-Date Fair Value
 
Number of Shares
 
Weighted-Average Exercise Price
Balance, January 1, 2013
2,525,382

 
476,526

 
$
18.31

 
8,250

 
$
10.95

Shares authorized - 2013 EIP
68,167

 
—

 
—

 
—

 
—

Shares authorized - Strategic Deployment Incentive Plan
2,211

 
—

 
—

 
—

 
—

Granted
(98,197
)
 
98,197

 
22.01

 
—

 
—

Stock options exercised
—

 
—

 
—

 
(8,250
)
 
10.95

Stock awards vested
—

 
(94,903
)
 
17.83

 
—

 
—

Forfeited
6,206

 
(11,830
)
 
18.83

 
—

 
—

Canceled
—

 
—

 
—

 
—

 
—

Balance, December 31, 2013
2,503,769

 
467,990

 
19.17

 
—

 
—

 
 
 
 
 
 
 
 
 
 
Shares authorized - 2014 EIP
76,230

 
—

 
—

 
—

 
—

Granted
(123,154
)
 
123,154

 
23.56

 
—

 
—

Stock awards vested
—

 
(144,941
)
 
18.57

 
—

 
—

Forfeited
3,363

 
(6,168
)
 
18.97

 
—

 
—

Canceled
—

 
—

 
—

 
—

 
—

Balance, December 31, 2014
2,460,208

 
440,035

 
20.60

 
—

 
—

 
 
 
 
 
 
 
 
 
 
Shares authorized - 2015 EIP
70,202

 
—

 
—

 
—

 
—

Granted
(81,591
)
 
81,591

 
24.44

 
—

 
—

Stock awards vested
—

 
(159,381
)
 
19.51

 
—

 
—

Forfeited
1,980

 
(3,384
)
 
23.85

 
—

 
—

Canceled
—

 
—

 
—

 
—

 
—

Balance, December 31, 2015
2,450,799

 
358,861

 
$
21.93

 
—

 
$
—

 
 
 
 
 
 
 
 
 
 
*Share and per share data gives retrospective recognition to a 10% stock dividend declared on July 22, 2015 and issued on August 14, 2015.