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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares The table below reconciles the weighted-average basic and diluted common shares outstanding:
Three Months Ended June 30,Six Months Ended June 30,
2019 2018 2019 2018 
(in thousands) 
Weighted average number of common shares outstanding - basic74,352 73,982 74,327 73,947 
Effect of dilutive securities 1
267 505 342 659 
Weighted average number of common shares outstanding - diluted74,619 74,487 74,669 74,606 
1.Certain outstanding equity awards are anti-dilutive and were therefore excluded from the calculation of the weighted average number of diluted common shares outstanding.
Schedule Anti-dilutive Outstanding Equity Awards Under Share Based Compensation Plans
Anti-dilutive outstanding equity awards under share based compensation plans were as follows:
Three Months Ended June 30,Six Months Ended June 30,
2019 2018 2019 2018 
(in thousands) 
Anti-dilutive 1,536 681 1,455 640