Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Quarterly Financial Information | |||||||||||
| Total operating revenues | $ 166,854 | $ 150,475 | $ 136,810 | $ 136,072 | $ 131,693 | $ 81,704 | $ 88,093 | $ 85,834 | $ 590,211 | $ 387,324 | $ 266,274 |
| Total operating expenses | 82,953 | 76,192 | 83,503 | 89,452 | 79,793 | 37,012 | 51,333 | 51,923 | 332,100 | 220,061 | 132,216 |
| Operating income | 83,901 | 74,283 | 53,307 | 46,620 | 51,900 | 44,692 | 36,760 | 33,911 | 258,111 | 167,263 | 134,058 |
| Net income (loss) | 73,351 | 70,524 | 49,912 | 42,916 | 49,008 | 42,648 | 35,124 | 32,325 | |||
| Pre-Water Acquisition net income attributed to parent | (7,841) | (15,674) | (16,678) | (40,193) | (22,234) | ||||||
| General partner's interest in net income attributable to incentive distribution rights | (7,557) | (4,806) | (2,731) | (1,850) | (969) | (295) | (16,944) | (1,264) | |||
| Limited partners' interest in net income | $ 65,794 | $ 65,718 | $ 47,181 | $ 41,066 | $ 48,039 | $ 34,512 | $ 19,450 | $ 15,647 | $ 219,759 | $ 117,648 | $ 7,422 |
| Basic and Diluted: | |||||||||||
| Common units (in dollars per share) | $ 0.37 | $ 0.37 | $ 0.27 | $ 0.23 | $ 0.27 | $ 0.23 | $ 0.13 | $ 0.10 | $ 1.24 | $ 0.76 | $ 0.05 |
| Subordinated units (in dollars per share) | $ 0.37 | $ 0.37 | $ 0.27 | $ 0.23 | $ 0.27 | $ 0.22 | $ 0.13 | $ 0.10 | $ 1.24 | $ 0.73 | $ 0.05 |