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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of common stock option activity
A summary of the Company’s common stock option activity as of and for the years ended December 31, 2018, 2017 and 2016 is presented below:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
Number of Shares

Weighted-Average Exercise Price per Share
 
Number of Shares
 
Weighted-Average Exercise Price per Share
 
Number of Shares
 
Weighted-Average Exercise Price per Share
Outstanding Stock Option Activity
 
 
 
 
 
 
 
 
 
 
 
Outstanding, beginning of period
826,498

 
$
11.00

 
835,786

 
$
11.00

 
840,298

 
$
11.00

Granted
—

 
$
—

 
—

 
$
—

 
—

 
$
—

Exercised
—

 
$
—

 
(9,288
)
 
$
11.00

 
—

 
$
—

Forfeited
(5,028
)
 
$
11.00

 
—

 
$
—

 
(4,512
)
 
$
11.00

Outstanding, end of period
821,470

 
$
11.00

 
826,498

 
$
11.00

 
835,786

 
$
11.00

Exercisable, end of period
821,470

 
$
11.00

 
826,498

 
$
11.00

 
42,042

 
$
11.00
Summary of restricted stock units
A summary of the Company’s restricted stock unit activity as of and for the years ended December 31, 2018, 2017 and 2016 is presented below:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
Number of Shares
 
Weighted-Average Grant-Date Fair Value per Share
 
Number of Shares
 
Weighted-Average Grant-Date Fair Value per Share
 
Number of Shares
 
Weighted-Average Grant-Date Fair Value per Share
Restricted Stock Unit Activity
 
 
 
 
 
 
 
 
 
 
 
Outstanding, beginning of period
562,082

 
$
10.72

 
474,989

 
$
10.66

 
308,386

 
$
14.20

Granted
179,268

 
$
11.24

 
343,933

 
$
10.84

 
414,045

 
$
10.05

Vested
(271,875
)
 
$
11.02

 
(211,475
)
 
$
10.76

 
(231,633
)
 
$
14.22

Forfeited
(248
)
 
$
10.05

 
(45,365
)
 
$
10.79

 
(15,809
)
 
$
11.62

Outstanding, end of period
469,227

 
$
10.75

 
562,082

 
$
10.72

 
474,989

 
$
10.66
Summary of performance share units
A summary of the Company’s performance share unit activity as of and for the years ended ended December 31, 2018 is presented below:
 
Year Ended December 31,
 
2018
 
Number of Shares
 
Weighted-Average Grant-Date Fair Value per Share
Performance Share Unit Activity
 
 
 
Outstanding, beginning of period
—

 
$
—

Granted (at target)
125,422

 
$
11.68

Vested
—

 
$
—

Forfeited
—

 
$
—

Outstanding, end of period (at target)
125,422

 
$
11.68
Summary of stock-based compensation expense
The expense related to the Company's stock-based compensation programs, included in general and administrative expense in the accompanying consolidated statements of operations, was as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(Dollars in thousands)
Expense related to:
 
 
 
 
 
Stock options
$
—

 
$
11

 
$
1,054

Restricted stock units and performance share units
3,090

 
2,792

 
2,417

 
$
3,090

 
$
2,803

 
$
3,471
Schedule of valuation assumptions
The following table presents details of the assumptions used to calculate the re-measurement date fair value of common stock options granted to Mr. Davis by the Company in accordance with ASC 505-50 as discussed in Note 1. Mr Davis' stock options fully vested on January 30, 2017 and were fully expensed. The below reflects fair value assumptions at January 30, 2017.
 
Period Ended January 30,
 
Year Ended December 31,
 
2017
 
2016
Expected term (in years)
1.0

 
1.1

Expected volatility
34.9
%
 
36.7
%
Risk-free interest rate
0.8
%
 
0.9
%
Expected dividends
—

 
—

Re-measurement date fair value per share
$
1.32

 
$
2.14