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Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 (units in thousands):
 
Restricted
Stock
Units
 
Weighted
Average
Grant Date
Fair Value
Unvested at January 1, 2018
1,139

 
$
33.41

Granted
1,097

 
22.95

Vested
(401
)
 
32.42

Forfeited
(137
)
 
30.34

Unvested at December 31, 2018
1,698

 
27.13