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Share Based Compensation, 401(k) Plan and Deferred Compensation - Restricted Performance Share Units (Details) - Executive Officer [Member] - Restricted Performance Share Units Plan [Member] - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 23, 2015 | Mar. 12, 2014 | Mar. 11, 2014 | Feb. 25, 2013 | Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2015, shares |  |  |  |  | 392,014
Granted, shares |  |  |  |  | 186,395
Units Accelerated for Qualifying Retirement |  |  |  |  | (22,820)
Non-vested at December 31, 2015, shares |  |  |  |  | 555,589
Units Granted | 186,395 | 61,720 | 134,284 | 231,093 |
Fair Value of Units on Grant Date (in thousands) | $ 3,933 | $ 1,225 | $ 2,624 | $ 4,137 |
February 25, 2013 RSPU Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2015, shares |  |  |  |  | 199,577
Granted, shares |  |  |  |  | 0
Units Accelerated for Qualifying Retirement |  |  |  |  | (8,255)
Non-vested at December 31, 2015, shares |  |  |  |  | 191,322
Measurement Period Commencement Date |  |  |  |  | Jan. 01, 2013
Measurement Period End Date |  |  |  |  | Dec. 31, 2015
March 11, 2014 RSPU Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Non-vested at January 1, 2015, shares |  |  |  |  | 130,717
Granted, shares |  |  |  |  | 0
Units Accelerated for Qualifying Retirement |  |  |  |  | (7,562)
Non-vested at December 31, 2015, 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, 2015, shares |  |  |  |  | 61,720
Granted, shares |  |  |  |  | 0
Units Accelerated for Qualifying Retirement |  |  |  |  | 0
Non-vested at December 31, 2015, 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, 2015, shares |  |  |  |  | 0
Granted, shares |  |  |  |  | 186,395
Units Accelerated for Qualifying Retirement |  |  |  |  | (7,003)
Non-vested at December 31, 2015, shares |  |  |  |  | 179,392
Measurement Period Commencement Date |  |  |  |  | Jan. 01, 2015
Measurement Period End Date |  |  |  |  | Dec. 31, 2017

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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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