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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of allocated stock-based compensation tock-based compensation expense consisted of the following during the years ended December 31, 2019, 2018 and 2017 (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Equity awards
$
8,105

 
$
7,388

 
$
8,460

Liability awards
2,336

 
1,096

 
1,580

Total stock-based compensation expense
$
10,441

 
$
8,484

 
$
10,040
Summary of stock option activity December 31, 2019:

 
Stock
Options
(in thousands)
 
Weighted
Average
Exercise Price
Per Share
 
Weighted
Average
Remaining
Life
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Options outstanding and exercisable, January 1, 2019
154

 
$
19.40

 
 
 
 
Options outstanding and exercisable, December 31, 2019
154

 
19.40

 
0.6
 
$
—
Schedule of valuaton assumptions
The following table presents the inputs used and the grant date fair value calculated in the Monte Carlo simulation model for the performance-based restricted stock units awarded during the years ended December 31, 2019 and 2018.

 
Year Ended December 31,
 
2019
 
2018
Remaining performance period as of grant date (in years)
2.9

 
2.8

Risk-free interest rate used
2.6
%
 
2.4
%
Grant-date fair value
$
12.91

 
$
13.46
Schedule of restricted stock, restricted stock unit, performance unit, cash settled restricted stock unit and cash settled performance unit activity
The following table presents restricted stock, restricted stock unit, performance-based restricted stock unit, cash-settled restricted stock unit and cash-settled performance unit activity during the year ended December 31, 2019:
 
Shares
(in thousands)
 
Weighted
Average
Grant Date
Fair Value
Per Share
Non-vested awards, January 1, 2019
1,728

 
$
9.68

Granted (1)
1,404

 
10.01

Vested (2)
(957
)
 
8.85

Canceled
(153
)
 
10.33

Non-vested awards, December 31, 2019 (3)(4)
2,022

 
10.25

——————
(1) 
The weighted average grant date fair value of shares granted during the years ended December 31, 2019, 2018 and 2017 was $10.01, $9.66 and $12.95, respectively.
(2) 
The total fair value of all awards vested during the years ended December 31, 2019, 2018 and 2017 was $9.0 million, $8.2 million and $10.8 million, respectively.
(3) 
Non-vested awards as of December 31, 2019 were comprised of 376,000 cash-settled restricted stock units and cash-settled performance units and 1,646,000 restricted stock, stock-settled restricted stock units and stock-settled performance-based restricted stock units.
(4) 
During the year ended December 31, 2019, the settlement terms of 99,631 performance units, with grant dates in 2018 and 2019, were modified from settlement in stock to cash. The change in award settlement from stock to cash was the only modification to these awards; the vesting, forfeiture and all other terms and conditions were unchanged. The modification resulted in a $0.2 million reclassification from additional paid-in capital to other current liabilities in our consolidated balance sheets and had an immaterial impact on our consolidated statements of operations.