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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | 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 Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: 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 + Details
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