Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (Unaudited) (Details)

v3.8.0.1
Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information                      
Total operating revenues $ 210,332 $ 193,629 $ 193,766 $ 174,770 $ 166,854 $ 150,475 $ 136,810 $ 136,072 $ 772,497 $ 590,211 $ 387,324
Total operating expenses 143,089 110,458 101,199 93,073 82,953 76,192 83,503 89,452 447,819 332,100 220,061
Operating income 67,243 83,171 92,567 81,697 83,901 74,283 53,307 46,620 324,678 258,111 167,263
Net income 64,155 80,893 87,175 75,092 73,351 70,524 49,912 42,916      
Less: general partner's interest in net income (23,772) (19,067) (15,328) (11,553) (7,557) (4,806) (2,731) (1,850) (69,720) (16,944) (1,264)
Limited partners' interest in net income $ 40,383 $ 61,826 $ 71,847 $ 63,539 $ 65,794 $ 65,718 $ 47,181 $ 41,066 $ 237,595 $ 219,759 $ 117,648
Net income per limited partner unit - basic and diluted $ 0.22 $ 0.33 $ 0.39 $ 0.35 $ 0.37 $ 0.37 $ 0.27 $ 0.23 $ 1.28 $ 1.24 $ 0.74
Impairment of property and equipment $ 23,000               $ 23,431