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Stock Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share Based Compensation Restricted Stock Activity
A summary of our restricted stock awards from January 1, 2014 to December 31, 2016 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2014
583,021

 
$
9.80

Granted
249,311

 
12.39

Forfeited
(537
)
 
9.32

Vested
(317,376
)
 
10.19

Unvested balance at December 31, 2014
514,419

 
10.82

Granted
216,159

 
14.48

Forfeited
(183
)
 
9.08

Vested
(255,828
)
 
10.39

Unvested balance at December 31, 2015
474,567

 
12.72

Granted
461,281

 
8.94

Forfeited
(126,610
)
 
10.08

Vested
(241,698
)
 
11.83

Unvested balance at December 31, 2016
567,540

 
$
10.62

Performance Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair Value Valuation Assumptions
The determination of the grant-date fair values of the awards granted included the following assumptions:
Award Grant Date
 
Volatility
 
Risk-Free Rate
 
Fair Value at Grant Date
March 3, 2013
 
39.2
%
 
0.36
%
 
$
9.55

March 3, 2014
 
33.5
%
 
0.66
%
 
$
12.77

May 15, 2014
 
33.1
%
 
0.80
%
 
$
9.88

February 27, 2015
 
22.9
%
 
1.01
%
 
$
12.13

February 26, 2016
 
24.3
%
 
0.93
%
 
$
8.42

Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2014 to December 31, 2016 is as follows:
 
Number of
Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2014
223.176

 
$
9.66

Granted
200,685

 
12.33

Additional units from dividends
12,309

 
12.01

Unvested balance at December 31, 2014
436,170

 
10.95

Granted
218,467

 
12.13

Additional units from dividends
21,722

 
13.51

Unvested balance at December 31, 2015
676,359

 
11.41

Granted
310,398

 
8.54

Additional units from dividends
38,324

 
9.37

Vested (1)
(242,096
)
 
9.85

Forfeited
(96,301
)
 
10.74

Unvested balance at December 31, 2016
686,684

 
$
10.65


______________________
(1)
The number of shares of common stock earned for the PSUs vested in 2016 was equal to 89.5% of the PSU Target Award.