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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Nonvested Share Activity [Table Text Block]
A summary of all non-vested shares activity for the six months ended June 30, 2019 was as follows:
 
Shares
 
Weighted Average Grant Date Price
Non-vested at December 30, 2018
796,476

 
$
13.12

Granted
468,199

 
$
9.48

Vested
(374,302
)
 
$
12.66

Non-vested at June 30, 2019
890,373

 
$
11.40