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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2019
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 June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Weighted-average common shares outstanding—basic
89,357

 
89,215

 
89,333

 
89,188

Dilutive effect of potential common shares
204

 

 
204

 

Weighted-average common shares outstanding—diluted
89,561

 
89,215

 
89,537

 
89,188