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Equity Allocations of net income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity [Abstract]    
Net income attributable to partners $ 14,595 $ 15,448
Less: General partner's IDRs (3,895) (1,984)
Net income available to partners $ 10,700 $ 13,464
General partner's ownership interest 2.00% 2.00%
General partner's allocated interest in net income $ 214 $ 269
General partner's IDR's 3,895 1,984
Total general partner's interest in net income $ 4,109 $ 2,253