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Share-Based Payments - Changes in Numbers of Outstanding Awards for Awards for Equity-Settled Plans (Details) - SMP - item
item in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SHARE-BASED PAYMENTS    
Beginning of period 1,051 1,600
Exercised (520) (444)
Forfeited (19) (105)
End of period 512 1,051