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Stocholders' Equity (Tables)
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block] The following table provides the computation of diluted weighted average number of common shares outstanding:

Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Computation of diluted weighted average shares outstanding:
 
 
 
 
 
 
 
Basic weighted average shares outstanding
53,212,759

 
51,226,898

 
52,546,647

 
51,563,090

Incremental shares from assumed exercise of stock options and vesting of restricted stock
1,489,700

 
1,494,766

 
1,399,123

 
1,537,018

Incremental shares from assumed conversion of convertible notes

 
771,171

 

 
771,171

Diluted weighted average shares outstanding
54,702,459

 
53,492,835

 
53,945,770

 
53,871,279