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EARNINGS PER SHARE | 12 Months Ended
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Dec. 31, 2019
EARNINGS PER SHARE |
EARNINGS PER SHARE | 17. EARNINGS PER SHARE A reconciliation of the weighted average shares used in the basic and diluted earnings per common share computations for the years ended December 31, 2019, 2018 and 2017 is presented below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Weighted-average shares outstanding: | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | 542,191 | ​ | 557,166 | ​ | 566,782
Dilutive securities | ​ | 4,417 | ​ | 7,088 | ​ | 10,359
Diluted | ​ | 546,608 | ​ | 564,254 | ​ | 577,141
​ For the years ended December 31, 2019, 2018 and 2017, options and awards outstanding totaling 4.4 million shares, 3.2 million shares and 7.9 million shares, respectively, were excluded from the calculations as their effect would have been antidilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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