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Equity Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2018
Equity Incentive Plan [Abstract]  
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
2016 Equity Incentive Plan
 
PSUs
at Target Performance Level
 
Weighted Average Grant Date Fair Value 1
Unvested balance as of December 31, 2016
 

 
$

Granted
 
250,609

 
$
19.39

Accrued PSU dividend equivalents
 
22,767

 
$

Vested
 

 
$

Unvested balance as of December 31, 2017
 
273,376

 
$
17.78

Granted
 
272,228

 
$
17.98

Accrued PSU dividend equivalents
 
61,171

 
$

Vested
 

 
$

Unvested balance as of December 31, 2018
 
606,775

 
$
16.08

_______________________
1.
Accrued PSU award dividend equivalents have a weighted average grant date fair value of $0.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following table summarizes RSU awards under our 2016 Equity Plan for fiscal years 2018, 2017 and 2016:
2016 Equity Incentive Plan
 
RSU Awards
 
Weighted Average Grant Date Fair Value 1
 
Weighted Average Vest Date Fair Value
Unvested balance as of December 31, 2015
 

 
$

 
$

Granted
 
101,407

 
$
17.89

 
$

Accrued RSU dividend equivalents
 
968

 
$

 
$

Unvested balance as of December 31, 2016
 
102,375

 
$
17.72

 
$

Granted
 
238,203

 
$
19.52

 
$

Accrued RSU dividend equivalents
 
32,498

 
$

 
$

Vested
 
(37,602
)
 
$
16.08

 
$
20.42

Forfeitures
 
(246
)
 
$
18.29

 
$

Unvested balance as of December 31, 2017
 
335,228

 
$
17.46

 
$

Granted 2
 
261,036

 
$
18.05

 
$

Accrued RSU dividend equivalents
 
56,618

 
$

 
$

Vested 2
 
(150,423
)
 
$
16.52

 
$
18.60

Forfeitures
 
(546
)
 
$
16.98

 
$

Unvested balance as of December 31, 2018
 
501,913

 
$
16.08

 
$

________________________________
1.
Accrued RSU award dividend equivalents have a weighted average grant date fair value of $0.
2.
Excludes 185,285 of RSU Exchange Awards.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes RSU and restricted stock transactions under the Director Plan for fiscal years 2017 and 2016:
Director Plan
 
Shares of Restricted Stock
 
RSU Awards
 
Weighted Average Grant Date Fair Value 1
 
Weighted Average Vest Date Fair Value
Unvested balance as of December 31, 2015
 
5,000
 
31,431

 
$
21.44

 
$

Granted
 

 
33,015

 
$
18.93

 
$

Accrued RSU dividend equivalents
 

 
3,527

 
$

 
$

Vested
 
(5,000
)
 
(46,538
)
 
$
20.00

 
$
18.99

Unvested balance as of December 31, 2016
 

 
21,435

 
$
17.49

 
$

Accrued RSU dividend equivalents
 

 
1,032

 
$

 
$

Vested
 

 
(22,467
)
 
$
16.69

 
$
20.15

Unvested balance as of December 31, 2017
 

 

 
$

 
$

________________________________
1.
Accrued RSU award dividend equivalents have a weighted average grant date fair value of $0.