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Equity - Schedule of Shares Issued (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2015
Performance Shares [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares granted (in shares) |  |  | 642,029
Shares vested measurement period (in years) | 3 years |  |
Vested in period (in shares) |  |  | 116,926
Performance Shares [Member] | Index Performance Shares - 1Q [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares granted (in shares) | 331,025 | 106,706 |
Grant date fair value per share (in dollars per share) | $ 5.81 | $ 6.82 |
Performance Shares [Member] | Peer Performance Shares - 1Q [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares granted (in shares) | 331,019 | 106,705 |
Grant date fair value per share (in dollars per share) | $ 5.37 | $ 6.34 |
Restricted Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares granted (in shares) | 237,570 | 237,560 |
Grant date fair value | $ 2,190 | $ 2,551 |
Award requisite service period (in years) | 3 years |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -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 The weighted average fair value at grant date for nonvested equity-based awards issued 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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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