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Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of additional information concerning restricted stock and restricted stock units
The following table summarizes restricted stock award activity, including performance stock units, for the year ended December 31, 2017 (units and shares in thousands):
 
Restricted
Stock
Units
 
Weighted
Average
Grant Date
Fair Value
Unvested at January 1, 2017
962

 
$
37.39

Granted
844

 
33.57

Vested
(419
)
 
35.10

Forfeited
(248
)
 
35.04

Unvested at December 31, 2017
1,139

 
33.41