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Share-Based Compensation - Schedule of Phantom Stock Plans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Employee Phantom Stock Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total liability for share awards | $ 50,233 | $ 48,148
Director Phantom Stock Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total liability for share awards | 7,000 | 8,436
Phantom Share Units (PSUs) [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total liability for share awards | $ 57,233 | $ 56,584

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options share based liability net. + References No definition available. + 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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- Details
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