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Earnings Per Share	3 Months Ended
Earnings Per Share	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share: The computation of diluted net loss per share does not include stock options and performance shares of 978,135 and 960,606 for the three months ended March 31, 2018 and 2017, respectively, because the effect of their inclusion would be anti-dilutive based on their respective exercise prices.