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Equity Incentive Plan (Tables)
 6 Months Ended
Jun. 30, 2015
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:
 
 
 
 
 
Weighted Average
 
 
 
Shares
 
Grant Date
 
 
 
Outstanding
 
Fair Value
 
 
 
 
 
 
 
 
 
Unvested restricted stock at December 31, 2014
 
 
238,626
 
$
26.24
 
 
 
 
 
 
 
 
 
Restricted stock granted
 
 
73,479
 
$
33.53
 
Restricted stock vested
 
 
(77,601)
 
$
25.10
 
Restricted stock forfeited
 
 
(14,410)
 
$
27.91
 
 
 
 
 
 
 
 
 
Unvested restricted stock at June 30, 2015
 
 
220,094
 
$
28.96