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Stock-Based Compensation and Other Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Restricted Stock Units Activity
Information regarding the restricted stock units activity and weighted average grant-date fair value follows:
 
Time Based Awards
 
Performance Based Awards
 
Restricted Stock Units
Weighted Average Grant-Date Fair Value
 
Restricted Stock Units
Weighted Average Grant-Date Fair Value
(Shares in thousands)
 
 
 
 
 
Outstanding at January 1, 2017
159

$
78.60

 
225

$
67.34

Granted
92

81.91

 
86

101.38

Forfeited/Canceled
(2
)
78.60

 
—

—

Vested
(9
)
78.60

 
—

—

Unvested outstanding at December 31, 2017
240

$
79.87

 
311

$
76.75