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Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 15, 2018 | Dec. 31, 2017 | Nov. 08, 2017 | Nov. 07, 2017 | Oct. 04, 2017
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Business combination, assets and liabilities assumed, unrecognized stock-based compensation expenses |  | $ 14,300,000 |  |  |
Expense for stock-based awards |  | 3,400,000 |  |  |
Expense for stock-based awards, fair value increase |  | 1,300,000 |  |  |
Share price |  |  | $ 11.00 | $ 10.20 | $ 10.20
Stock-based awards unrecognized compensation cost |  | $ 8,900,000 |  |  |
Stock-based award weighted-average recognition period for unrecognized compensation cost |  | 2 years |  |  |
Cash contribution to 401(k) plan |  | $ 154,000 |  |  |
Phantom Stock Units |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Liability for phantom stock units |  | $ 19,500,000 |  |  |
Granted stock-based awards, subsequent to year-end |  | 0 |  |  |
Restricted Stock Awards |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Granted stock-based awards, subsequent to year-end |  | 10 |  |  |
Restricted Stock Awards | Subsequent Event |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Granted stock-based awards, subsequent to year-end | 800 |  |  |  |
Performance Stock Awards | Subsequent Event |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Granted stock-based awards, subsequent to year-end | 400 |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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