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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
PUs
$
4,327

 
$
4,635

 
$
9,171

 
$
9,953

RSUs
2,052

 
2,052

 
6,896

 
5,805

Stock options
933

 
953

 
2,939

 
2,775

Total
$
7,312

 
$
7,640

 
$
19,006

 
$
18,533