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Stockholders' Equity (Schedule of Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | $ 15,420 | $ 14,043 | $ 10,817
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 444 | 974 | 1,412
Deferred Stock Unit |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 7,830 | 7,023 | 4,343
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 1,770 | 1,031 | 910
Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | $ 5,376 | $ 5,015 | $ 4,152

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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