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Share Based Compensation - Restricted Performance Share Units (Details) - Restricted Performance Share Units Plan [Member] - Executive Officer [Member] - USD ($) $ in Thousands |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2018 | Mar. 01, 2017 | Feb. 22, 2016 | Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Non-vested at January 1, 2018, shares |  |  |  | 400,488
Granted, shares |  |  |  | 209,193
Units Cancelled |  |  |  | 0
Non-vested at March 31, 2018, shares |  |  |  | 609,681
Units Granted | 209,193 | 174,854 | 231,388 |
Fair Value of Units on Grant Date (in thousands) | $ 4,276 | $ 3,735 | $ 3,558 |
February 22, 2016 RSPU Grant [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Non-vested at January 1, 2018, shares |  |  |  | 228,077
Granted, shares |  |  |  | 0
Units Cancelled |  |  |  | 0
Non-vested at March 31, 2018, shares |  |  |  | 228,077
Measurement Period Commencement Date |  |  |  | Jan. 01, 2016
Measurement Period End Date |  |  |  | Dec. 31, 2018
March 01, 2017 RSPU Grant [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Non-vested at January 1, 2018, shares |  |  |  | 172,411
Granted, shares |  |  |  | 0
Units Cancelled |  |  |  | 0
Non-vested at March 31, 2018, shares |  |  |  | 172,411
Measurement Period Commencement Date |  |  |  | Jan. 01, 2017
Measurement Period End Date |  |  |  | Dec. 31, 2019
February 28, 2018 RSPU Grant [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Non-vested at January 1, 2018, shares |  |  |  | 0
Granted, shares |  |  |  | 209,193
Units Cancelled |  |  |  | 0
Non-vested at March 31, 2018, shares |  |  |  | 209,193
Measurement Period Commencement Date |  |  |  | Jan. 01, 2018
Measurement Period End Date |  |  |  | Dec. 31, 2020

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- Definition Share based compensation arrangement by share based payment award measurement period end date. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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