v3.7.0.1
Partnership Equity and Distributions (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 09, 2017
shares
Feb. 08, 2017
USD ($)
$ / shares
Jan. 11, 2017
$ / shares
Nov. 24, 2016
USD ($)
$ / shares
Nov. 18, 2016
USD ($)
Aug. 24, 2016
USD ($)
$ / shares
May 25, 2016
USD ($)
$ / shares
Feb. 29, 2016
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
$ / item
Dec. 31, 2016
USD ($)
Partnership equity and distributions                    
Annual cash distribution (per unit)                 0.68  
Minimum cash distributions to trigger unitholder and general partner distributions | $ / shares                 $ 0.1955  
Cash distribution declared | $ / shares     $ 0.28           $ 0.30  
Subordinated units | shares 75,940,957                  
Common units conversion ratio 1                  
Distributions | $   $ 57,633   $ 51,845 $ 849 $ 46,775 $ 43,252 $ 39,725 $ 57,633 $ 182,446
Distributions per limited partner unit (in dollars per share) | $ / shares   $ 0.2800   $ 0.2650   $ 0.2500 $ 0.2350 $ 0.2200    
General Partner                    
Partnership equity and distributions                    
Distributions | $   $ 7,543   $ 4,820   $ 2,731 $ 1,850 $ 969 7,543 10,370
Common units | Limited Partner (Common units)                    
Partnership equity and distributions                    
Distributions | $   28,827   26,901 $ 849 25,059 23,556 22,048 28,827 98,413
Limited Partner (Subordinated units) | Limited Partner (Common units)                    
Partnership equity and distributions                    
Distributions | $   $ 21,263   $ 20,124   $ 18,985 $ 17,846 $ 16,708 $ 21,263 $ 73,663
Above $0.1955 up to $0.2125                    
Partnership equity and distributions                    
Unitholders marginal percentage interest in distribution                 85.00%  
General Partners marginal percentage interest in distribution                 15.00%  
Above $0.2125 up to $0.2550                    
Partnership equity and distributions                    
Unitholders marginal percentage interest in distribution                 75.00%  
General Partners marginal percentage interest in distribution                 25.00%  
Above $0.2550                    
Partnership equity and distributions                    
Unitholders marginal percentage interest in distribution                 50.00%  
General Partners marginal percentage interest in distribution                 50.00%  
Minimum                    
Partnership equity and distributions                    
Minimum quarterly cash distribution (per unit)                 0.17  
Minimum | Above $0.1955 up to $0.2125                    
Partnership equity and distributions                    
Pro rata cash distribution to the holders of common and subordinate units                 0.1955  
Minimum | Above $0.2125 up to $0.2550                    
Partnership equity and distributions                    
Pro rata cash distribution to the holders of common and subordinate units                 0.2125  
Minimum | Above $0.2550                    
Partnership equity and distributions                    
Pro rata cash distribution to the holders of common and subordinate units                 0.2550  
Maximum | Above $0.1955 up to $0.2125                    
Partnership equity and distributions                    
Pro rata cash distribution to the holders of common and subordinate units                 0.2125  
Maximum | Above $0.2125 up to $0.2550                    
Partnership equity and distributions                    
Pro rata cash distribution to the holders of common and subordinate units                 0.2550