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Long-Term Incentive Program Long-Term Incentive Program (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
The following is a summary of LTIP award activity for 2016:
 
 
Number of Performance Units at Target
 
Weighted Average Grant Date Fair Value
 
Maximum Shares Eligible to Receive
 
 
 
 
 
 
 
Unvested - December 31, 2015
 
100,900

 
$
52.80

 
183,401

Granted
 
118,525

 
59.13

 
237,050

Vested
 
—

 
—

 
—

Canceled
 
(2,550
)
 
52.80

 
(4,635
)
Unvested - June 30, 2016
 
216,875

 
56.26

 
415,816