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Stock Based and Deferred Compensation (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Summary of compensation expense and stock award activity |  |  |  |
Stock-based compensation expense | $ 3,835 | $ 2,853 | $ 8,465 | $ 5,264
Stock options exercised | 200 | 0 | 143,640 | 40,245
Restricted Stock [Member] |  |  |  |
Summary of compensation expense and stock award activity |  |  |  |
Restricted stock awards vested (includes performance-based awards) | 44,134 | 7,220 | 370,204 | 307,390
Time Based Restricted Stock [Member] |  |  |  |
Summary of compensation expense and stock award activity |  |  |  |
Non-vested shares granted | 15,000 | 19,400 | 403,787 | 374,683
Performance Shares [Member] |  |  |  |
Summary of compensation expense and stock award activity |  |  |  |
Non-vested shares granted | 0 | 0 | 66,187 | 52,083

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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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