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(Loss) Earnings Per Common Share (Reconciliation of Numerator and Denominator for Calculating Earnings Per Share from Net Income) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator—Basic            
Net (loss) income $ (19,568) $ (9,878) $ (2,818) $ 11,865 $ (29,446) $ 9,047
Less: income attributable to participating shares           282
Less: income attributable to non-controlling interest 2,733   1,235   4,821 2,122
Net (loss) income attributable to NCS Multistage Holdings, Inc.—Basic (22,301)   (4,053)   (34,267) 6,643
Numerator—Diluted            
Net (loss) income (19,568) $ (9,878) (2,818) $ 11,865 (29,446) 9,047
Less: income attributable to non-controlling interest 2,733   1,235   4,821 2,122
Net (loss) income attributable to NCS Multistage Holdings, Inc.—Diluted $ (22,301)   $ (4,053)   $ (34,267) $ 6,925
Denominator            
Basic weighted average number of shares (in shares) 46,766,000   44,778,000   46,380,000 44,517,000
Exchangeable shares for common stock (in shares)           1,434,000
Dilutive effect of stock options, RSUs, PSUs and ESPP           1,235,000
Diluted weighted average number of shares (in shares) 46,766,000   44,778,000   46,380,000 47,186,000
(Loss) earnings per common share            
Basic (in dollars per share) $ (0.48)   $ (0.09)   $ (0.74) $ 0.15
Diluted (in dollars per share) $ (0.48)   $ (0.09)   $ (0.74) $ 0.15
Potentially dilutive securities excluded as anti-dilutive 4,449,000   5,040,000   4,418,000 231,000