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QUARTERLY FINANCIAL DATA (UNAUDITED) | 12 Months Ended
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Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |
QUARTERLY FINANCIAL DATA (UNAUDITED) | QUARTERLY FINANCIAL DATA (UNAUDITED) The following table summarizes quarterly financial data for the years ended December 31, 2015 and 2014:
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
| (Thousands of Dollars, Except Per Unit Data)
2015: |  |  |  |  |  |  |  |  |
Revenues | $ | 554,944 |  |  | $ | 570,611 |  |  | $ | 493,566 |  |  | $ | 464,919 |  |  | $ | 2,084,040 |
Operating income | $ | 99,281 |  |  | $ | 92,405 |  |  | $ | 100,994 |  |  | $ | 98,024 |  |  | $ | 390,704 |
Income from continuing operations | $ | 127,125 |  |  | $ | 54,325 |  |  | $ | 65,016 |  |  | $ | 59,480 |  |  | $ | 305,946 |
Income from discontinued operations, net of tax | 774 |  |  | — |  |  | — |  |  | — |  |  | 774 |
Net income | $ | 127,899 |  |  | $ | 54,325 |  |  | $ | 65,016 |  |  | $ | 59,480 |  |  | $ | 306,720 |
Net income per unit applicable to limited partners: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 1.46 |  |  | $ | 0.54 |  |  | $ | 0.68 |  |  | $ | 0.61 |  |  | $ | 3.29 |
Discontinued operations | 0.01 |  |  | — |  |  | — |  |  | — |  |  | 0.01 |
Total | $ | 1.47 |  |  | $ | 0.54 |  |  | $ | 0.68 |  |  | $ | 0.61 |  |  | $ | 3.30 |
Cash distributions per unit applicable to limited partners | $ | 1.095 |  |  | $ | 1.095 |  |  | $ | 1.095 |  |  | $ | 1.095 |  |  | $ | 4.380 |
2014: |  |  |  |  |  |  |  |  |
Revenues | $ | 849,213 |  |  | $ | 749,745 |  |  | $ | 794,422 |  |  | $ | 681,738 |  |  | $ | 3,075,118 |
Operating income | $ | 81,103 |  |  | $ | 89,354 |  |  | $ | 95,098 |  |  | $ | 81,346 |  |  | $ | 346,901 |
Income from continuing operations | $ | 42,996 |  |  | $ | 57,187 |  |  | $ | 59,117 |  |  | $ | 54,869 |  |  | $ | 214,169 |
(Loss) income from discontinued operations, net of tax | (3,359 | ) |  | (1,788 | ) |  | 2,831 |  |  | (1,475 | ) |  | (3,791 | )
Net income | $ | 39,637 |  |  | $ | 55,399 |  |  | $ | 61,948 |  |  | $ | 53,394 |  |  | $ | 210,378 |
Net income (loss) per unit applicable to limited partners: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.40 |  |  | $ | 0.58 |  |  | $ | 0.61 |  |  | $ | 0.55 |  |  | $ | 2.14 |
Discontinued operations | (0.04 | ) |  | (0.02 | ) |  | 0.03 |  |  | (0.01 | ) |  | (0.04 | )
Total | $ | 0.36 |  |  | $ | 0.56 |  |  | $ | 0.64 |  |  | $ | 0.54 |  |  | $ | 2.10 |
Cash distributions per unit applicable to limited partners | $ | 1.095 |  |  | $ | 1.095 |  |  | $ | 1.095 |  |  | $ | 1.095 |  |  | $ | 4.380 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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