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Share Based Compensation - Restricted Performance Share Units (Details) - Executive Officer [Member] - Restricted Performance Share Units Plan [Member] - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 22, 2016 | Feb. 23, 2015 | Mar. 12, 2014 | Mar. 11, 2014 | Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2016, shares |  |  |  |  | 364,267
Granted, shares |  |  |  |  | 231,388
Units Accelerated for Qualifying Retirement |  |  |  |  | 0
Non-vested at March 31, 2016, shares |  |  |  |  | 595,655
Units Granted | 231,388 | 186,395 | 61,720 | 134,284 |
Fair Value of Units on Grant Date (in thousands) | $ 3,558 | $ 3,933 | $ 1,255 | $ 2,624 |
March 11, 2014 RSPU Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2016, shares |  |  |  |  | 123,155
Granted, shares |  |  |  |  | 0
Units Accelerated for Qualifying Retirement |  |  |  |  | 0
Non-vested at March 31, 2016, shares |  |  |  |  | 123,155
Measurement Period Commencement Date |  |  |  |  | Jan. 01, 2014
Measurement Period End Date |  |  |  |  | Dec. 31, 2016
March 12, 2014 RSPU Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2016, shares |  |  |  |  | 61,720
Granted, shares |  |  |  |  | 0
Units Accelerated for Qualifying Retirement |  |  |  |  | 0
Non-vested at March 31, 2016, shares |  |  |  |  | 61,720
Measurement Period Commencement Date |  |  |  |  | Jan. 01, 2014
Measurement Period End Date |  |  |  |  | Dec. 31, 2016
February 23, 2015 RSPU Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2016, shares |  |  |  |  | 179,392
Granted, shares |  |  |  |  | 0
Units Accelerated for Qualifying Retirement |  |  |  |  | 0
Non-vested at March 31, 2016, shares |  |  |  |  | 179,392
Measurement Period Commencement Date |  |  |  |  | Jan. 01, 2015
Measurement Period End Date |  |  |  |  | Dec. 31, 2017
February 22, 2016 RSPU Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2016, shares |  |  |  |  | 0
Granted, shares |  |  |  |  | 231,388
Units Accelerated for Qualifying Retirement |  |  |  |  | 0
Non-vested at March 31, 2016, shares |  |  |  |  | 231,388
Measurement Period Commencement Date |  |  |  |  | Jan. 01, 2016
Measurement Period End Date |  |  |  |  | Dec. 31, 2018

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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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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