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Stocholders' Equity (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Computation of diluted weighted average shares outstanding:
 
 
 
 
 
 
 
Basic weighted average shares outstanding
54,449,256

 
51,182,502

 
53,180,850

 
51,436,228

Incremental shares from assumed exercise of stock options and vesting of restricted stock
1,522,805

 
1,521,560

 
1,441,369

 
1,525,204

Incremental shares from assumed conversion of convertible notes
—

 
1,559,830

 
—

 
1,559,830

Diluted weighted average shares outstanding
55,972,061

 
54,263,892

 
54,622,219

 
54,521,262