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Employee Termination Benefits (Details) - USD ($) shares in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Employee Termination Benefits |  |
Cash |  | $ 18,637,000
Share-Based Compensation |  | $ 12,950,000
Number of Shares |  | 763
Total Employee Termination Benefits | $ 0 | $ 31,587,000
Executive Employee Termination Benefits |  |
Employee Termination Benefits |  |
Cash |  | 11,945,000
Share-Based Compensation |  | $ 9,114,000
Number of Shares |  | 554
Total Employee Termination Benefits |  | $ 21,059,000
Other Employee Termination Benefits |  |
Employee Termination Benefits |  |
Cash |  | 6,692,000
Share-Based Compensation |  | $ 3,836,000
Number of Shares |  | 209
Total Employee Termination Benefits |  | $ 10,528,000

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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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