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Stock Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
A summary of restricted stock award activity during the three months ended March 31, 2018 is presented below:

 
Shares
Weighted Average Price
Nonvested at December 31, 2017
405,536

$
44.58

Restricted stock units granted
131,341

51.83

Vested
(107,390
)
61.63

Forfeited
(401
)
48.79

Nonvested at March 31, 2018
429,086

$
42.52

A summary of performance share award activity during the three months ended March 31, 2018 is presented below:



Shares
Weighted
Average Price
Nonvested at December 31, 2017
400,037

$
55.65

Granted (three-year vesting period)
158,262

68.08

Vested and paid
(112,710
)
83.94

Forfeited
(488
)
58.26

Nonvested at March 31, 2018
445,101

$
52.90