Stock-Based Compensation (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Long-Term Incentive Plans | The following table presents restricted stock units granted, vested and forfeited during 2018 under the Stock Plan:
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| Schedule of Share-based Compensation, Time-based Phantom Stock Units Activity | The following table presents time-based phantom stock units granted, vested, and forfeited during 2018 under the Stock Plan:
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| Schedule of Nonvested Performance-based Units Activity | The following table presents performance cash units granted, vested, and forfeited during 2018 under the Stock Plan:
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| Share-Based Compensation, Performance-Based Stock Units Activity | The following table presents performance-based phantom stock units granted, vested, and forfeited during 2018 under the Stock Plan:
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- Definition [Table Text Block] for Schedule of Share-based Compensation, time-based phantom stock units activity [Table] No definition available.
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- Definition [Table Text Block] for Share-Based Compensation, performance-based phantom stock units activity [Table] No definition available.
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- References No definition available.
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. No definition available.
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