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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The denominators of the basic and diluted earnings per share computations are as follows (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Weighted-average common shares outstanding—basic and diluted
88,921

 
88,766

 
88,885

 
82,633