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Share-Based Compensation - (Tables)
 6 Months Ended
Jun. 30, 2017
Share-based Compensation [Abstract]  
Summary of restricted stock unit activity [Table Text Block]
A summary of the Company’s nonvested restricted stock unit activity with respect to the six months ended June 30, 2017 is as follows:


Number of Shares

Weighted Average Grant Date Fair Value
Nonvested at December 31, 2016

1,136


$
12.30

Granted

273


$
22.62

Vested

(277
)

$
11.35

Forfeited

(30
)

$
12.30

Nonvested at June 30, 2017

1,102


$
15.10