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Earnings Per Share | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic EPS is computed by dividing net income attributable to NiSource by the weighted-average number of shares of common stock outstanding for the period. The weighted-average shares outstanding for diluted EPS includes the incremental effects of the various long-term incentive compensation plans. The numerator in calculating both basic and diluted EPS for each period is reported net income attributable to NiSource. The computation of diluted average common shares is as follows:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
Denominator |  |  |  |  |  |  |
Basic average common shares outstanding | 322,318 |  |  | 318,090 |  |  | 321,445 |  |  | 317,390 |
Dilutive potential common shares: |  |  |  |  |  |  |
Shares contingently issuable under employee stock plans | 228 |  |  | — |  |  | 146 |  |  | — |
Shares restricted under employee stock plans | 1,372 |  |  | 3,375 |  |  | 1,606 |  |  | 3,328 |
Diluted Average Common Shares | 323,918 |  |  | 321,465 |  |  | 323,197 |  |  | 320,718 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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