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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of common stock option activity
 
Three Months Ended March 31,
 
2017
 
2016
 
Number of Shares
 
Weighted-Average Exercise Price per Share
 
Number of Shares
 
Weighted-Average Exercise Price per Share
Stock Option Activity
 
 
 
 
 
 
 
Outstanding, beginning of period
835,786

 
$
11.00

 
840,298

 
$
11.00

Granted
—

 
$
—

 
—

 
$
—

Exercised
—

 
$
—

 
—

 
$
—

Forfeited
—

 
$
—

 
(2,112
)
 
$
11.00

Outstanding, end of period
835,786

 
$
11.00

 
838,186

 
$
11.00

Exercisable, end of period
835,786

 
$
11.00

 
44,442

 
$
11.00

A summary of the Company’s common stock option activity as of and for the year ended December 31, 2016, 2015 and 2014 is presented below:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
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
840,298

 
$
11.00

 
846,874

 
$
11.00

 
—

 
$
—

Granted
—

 
$
—

 
—

 
$
—

 
872,683

 
$
11.00

Exercised
—

 
$
—

 
(1,584
)
 
$
11.00

 
—

 
$
—

Forfeited
(4,512
)
 
$
11.00

 
(4,992
)
 
$
11.00

 
(25,809
)
 
$
11.00

Outstanding, end of period
835,786

 
$
11.00

 
840,298

 
$
11.00

 
846,874

 
$
11.00

Exercisable, end of period
42,042

 
$
11.00

 
23,133

 
$
11.00

 
—

 
$
—
Summary of restricted stock units
 
Three Months Ended March 31,
 
2017
 
2016
 
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
474,989

 
$
10.66

 
308,386

 
$
14.20

Granted
293,223

 
$
10.67

 
409,509

 
$
10.05

Vested
(204,846
)
 
$
10.60

 
(226,516
)
 
$
14.15

Forfeited
(3,102
)
 
$
11.11

 
(3,980
)
 
$
13.68

Outstanding, end of period
560,264

 
$
10.68

 
487,399

 
$
10.74

A summary of the Company’s restricted stock units activity as of and for the year ended December 31, 2016, 2015 and 2014 is presented below:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
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 Units Activity
 
 
 
 
 
 
 
 
 
 
 
Outstanding, beginning of period
308,386

 
$
14.20

 
112,233

 
$
11.36

 
—

 
$
—

Granted
414,045

 
$
10.05

 
294,355

 
$
14.46

 
118,937

 
$
11.34

Vested
(231,633
)
 
$
14.22

 
(85,386
)
 
$
11.48

 
—

 
$
—

Forfeited
(15,809
)
 
$
11.62

 
(12,816
)
 
$
13.44

 
(6,704
)
 
$
11.00

Outstanding, end of period
474,989

 
$
10.66

 
308,386

 
$
14.20

 
112,233

 
$
11.36
Summary of stock-based compensation expense
 
Three Months Ended March 31,
 
2017
 
2016
 
(Dollars in thousands)
Expense related to:
 
 
 
Stock options
$
11

 
$
262

Restricted stock units
600

 
723

 
$
611

 
$
985

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,
 
2016
 
2015
 
2014
 
(Dollars in thousands)
Expense related to:
 
 
 
 
 
Equity based incentive units
$
—

 
$
—

 
$
317

Stock options
1,054

 
1,184

 
1,128

Restricted stock units
2,417

 
2,700

 
877

 
$
3,471

 
$
3,884

 
$
2,322
Schedule of valuation assumptions
The following table presents details of the assumptions used to calculate the weighted-average grant date fair value of common stock options granted by the Company:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Expected term (in years)
4.3

 
4.3

 
4.3

Expected volatility
49.0
%
 
49.0
%
 
49.0
%
Risk-free interest rate
1.2
%
 
1.2
%
 
1.2
%
Expected dividends
—

 
—

 
—

Weighted-average grant date fair value per share
$
4.43

 
$
4.43

 
$
4.43

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:
 
Year Ended December 31,
 
2016
 
2015
Expected term (in years)
1.1

 
2.1

Expected volatility
36.7
%
 
28.2
%
Risk-free interest rate
0.9
%
 
1.1
%
Expected dividends
—

 
—

Re-measurement date fair value per share
$
2.14

 
$
3.21