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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | 16. Stock-Based Compensation We have granted restricted stock, restricted stock units and performance-based restricted stock units to employees and non-employee directors under the Archrock, Inc. 2013 Stock Incentive Plan. The following table presents restricted stock, restricted stock unit, performance-based restricted stock unit and cash-settled performance unit activity during the six months ended June 30, 2019:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value Per Share
Non-vested awards, January 1, 2019 | 1,728 |  |  | $ | 9.68 |
Granted | 1,383 |  |  | 10.01 |
Vested | (402 | ) |  | 6.33 |
Canceled | (153 | ) |  | 10.33 |
Non-vested awards, June 30, 2019 (1)(2) | 2,556 |  |  | 10.35 |
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(1) | Non-vested awards as of June 30, 2019 are comprised of 451,000 cash-settled restricted stock units and cash-settled performance units and 2,105,000 restricted shares and stock-settled performance units.
(2) | During the three months ended June 30, 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 condensed consolidated balance sheets and had an immaterial impact on our condensed consolidated statements of operations.
As of June 30, 2019, we expect $18.5 million of unrecognized compensation cost related to unvested restricted stock, stock-settled restricted stock units, performance units, cash-settled restricted stock units and cash-settled performance units to be recognized over the weighted-average period of 2.2 years. Total stock-based compensation expense consisted of the following (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Equity awards | $ | 1,512 |  |  | $ | 1,969 |  |  | $ | 3,869 |  |  | $ | 3,763 |
Liability awards | 640 |  |  | 666 |  |  | 1,606 |  |  | 967 |
Total stock-based compensation | $ | 2,152 |  |  | $ | 2,635 |  |  | $ | 5,475 |  |  | $ | 4,730 |

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- References No definition available. + Details
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