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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Expense By Type [Table Text Block]
Share-based compensation expense was as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
PUs
$
506

 
$
4,327

 
$
3,885

 
$
9,171

RSUs
2,467

 
2,052

 
7,776

 
6,896

Stock options
802

 
933

 
2,456

 
2,939

Total
$
3,775

 
$
7,312

 
$
14,117

 
$
19,006