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Summary of Quarterly Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Oct. 06, 2013
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                        
Revenues $ 165,200 $ 175,779 $ 164,773 $ 151,882 $ 170,411 $ 169,441 $ 155,168 $ 140,306 $ 127,583 $ 206,072 $ 657,634 $ 635,326
Total operating income (loss) 37,230 45,343 45,039 23,757 31,282 43,412 42,539 24,088 (117,110) 53,553 151,369 141,321
Net income 19,370 26,085 26,585 7,888 10,964 22,734 25,281 11,231 193,431 $ (37,232) 79,928 70,210
Net income attributable to common unitholders $ 19,136 $ 25,851 $ 26,351 $ 7,654 $ 10,729 $ 22,493 $ 25,281 $ 11,231 $ 193,431   $ 78,992 $ 69,734
Basic and diluted net income per share (in dollars per share) $ 0.07 $ 0.10 $ 0.10 $ 0.03 $ 0.04 $ 0.09 $ 0.10 $ 0.05 $ 0.79   $ 0.29 $ 0.27