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Equity Allocations of net income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]    
Net income attributable to partners $ 15,448 $ 14,640
Less: General partner's IDRs (1,984) (606)
Net income available to partners $ 13,464 $ 14,034
General partner's ownership interest 2.00% 2.00%
General partner's allocated interest in net income $ 269 $ 281
General partner's IDR's 1,984 606
Total general partner's interest in net income $ 2,253 $ 887