Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (Unaudited) (Details)

v3.6.0.2
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