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Equity Incentive Plan (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Restricted stock activity is summarized as follows:
 
 
 
Shares
Outstanding
(in thousands)
 
 
Weighted Average
Grant Date
Fair Value
 
 
 
 
 
 
 
 
Unvested restricted stock at December 31, 2017
 
 
227
 
 
$
39.47
 
 
 
 
 
 
 
 
 
 
Restricted stock granted
 
 
50
 
 
$
47.73
 
Restricted stock vested
 
 
(65
)
 
$
35.40
 
Restricted stock forfeited
 
 
(1
)
 
$
48.28
 
 
 
 
 
 
 
 
 
 
Unvested restricted stock at September 30, 2018
 
 
211
 
 
$
42.66