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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Stock-based Compensation Expense | Stock-based compensation expense relates to awards issued in connection with and after the Separation. Information related to stock-based compensation expense is as follows (in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Stock-based compensation expense |  | $ | 9,423 |  |  | $ | 2,627 |
Income tax benefit related to stock-based compensation expense |  |  | 1,222 |  |  | 643 |
Schedule of Outstanding Stock-based Compensation Awards | Information related to outstanding stock-based compensation awards as of December 31, 2018 is as follows (in thousands):
|  | Unearned Compensation |  |  | Weighted-Average Remaining Period (in years) |
RSUs |  | $ | 14,393 |  |  |  | 2.7 |
PSUs |  |  | 6,133 |  |  |  | 2.2 |
ESPP |  |  | 135 |  |  |  | 0.3 |
Total |  | $ | 20,661 |  |  |  | 2.5 |
Summary of RSU Activity | RSU activity for the year ended December 31, 2018 is as follows (in thousands, except for weighted-average grant date fair value):
|  | Number of RSUs |  |  | Weighted-Average Grant Date Fair Value |
Outstanding as of December 31, 2017 |  |  | 526 |  |  | $ | 25.48 |
Granted |  |  | 522 |  |  |  | 26.63 |
Vested and delivered |  |  | (159 | ) |  |  | 25.11 |
Forfeited |  |  | (120 | ) |  |  | 26.40 |
Outstanding as of December 31, 2018 (1) |  |  | 769 |  |  | $ | 26.20 |
(1) | The outstanding balance as of December 31, 2018 includes 59,000 RSUs that were vested, but not yet delivered.

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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