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Employee Stock Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
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
 
Shares Available for Grant
 
Number of Shares
 
Weighted-Average Grant-Date Fair Value
Balance, January 1, 2014
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

Shares authorized - 2016 EIP
59,342

 
—

 
—

Shares authorized - Restricted Stock Award Plan(1)
229,439

 
—

 
—

Granted
(79,118
)
 
79,118

 
26.19

Stock awards vested
—

 
(155,981
)
 
20.47

Forfeited
3,543

 
(5,383
)
 
23.39

Canceled
(1,950,000
)
 
—

 
—

Balance, December 31, 2016
714,005

 
276,615

 
$
23.94