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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2015 to December 31, 2017 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2015
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

Granted
324,502

 
11.19

Forfeited
(16,669
)
 
10.80

Vested
(244,411
)
 
11.29

Unvested balance at December 31, 2017
630,962

 
$
10.66
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 outstanding awards included the following assumptions:
Award Grant Date
 
Volatility
 
Risk-Free Rate
 
Fair Value at Grant Date
February 27, 2015
 
22.9
%
 
1.01
%
 
$
12.13

February 26, 2016
 
24.3
%
 
0.93
%
 
$
8.42

February 26, 2017
 
26.7
%
 
1.46
%
 
$
10.89
Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2015 to December 31, 2017 is as follows:
 
Number of
Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2015
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

Granted
266,009

 
11.04

Additional units from dividends
33,478

 
11.17

Vested (2)
(200,374
)
 
12.15

Unvested balance at December 31, 2017
785,797

 
$
10.42


______________________
(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.
(2)
There was no payout of shares of our common stock for PSUs that vested on February 27, 2017, as our total stockholder return fell below the 30th percentile of the total stockholder returns of the peer group over the three-year performance period.