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Share-Based Payments (Details 9) - Performance stock units settled in cash
shares in Thousands
12 Months Ended
Dec. 31, 2018
shares
Performance stock units settled in cash  
Beginning Balance, Unvested, Shares 0
Shares, Granted 45,000
Shares, Vested 0
Shares, Forfeited (5,000)
Ending Balance, Unvested, Shares 40,000