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Partnership Equity and Distributions (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 16, 2017
USD ($)
$ / shares
May 10, 2017
USD ($)
$ / shares
Apr. 30, 2017
USD ($)
Feb. 09, 2017
shares
Feb. 08, 2017
USD ($)
$ / shares
Nov. 24, 2016
USD ($)
$ / shares
Nov. 08, 2016
USD ($)
Aug. 24, 2016
USD ($)
$ / shares
May 25, 2016
USD ($)
$ / shares
Feb. 29, 2016
USD ($)
$ / shares
Sep. 30, 2017
$ / shares
Sep. 30, 2017
$ / shares
$ / item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
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                     $ 0.34      
Subordinated units | shares       75,940,957                    
Common units conversion ratio       1                    
Distributions | $ $ 75,023 $ 67,306 $ 75   $ 57,633 $ 51,845 $ 849 $ 46,775 $ 43,252 $ 39,725     $ 200,037 $ 182,446
Distributions per limited partner unit (in dollars per share) | $ / shares $ 0.3200 $ 0.3000     $ 0.2800 $ 0.2650   $ 0.2500 $ 0.2350 $ 0.2200        
General Partner                            
Partnership equity and distributions                            
Distributions | $ $ 15,328 $ 11,553     $ 7,543 $ 4,820   $ 2,731 $ 1,850 $ 969     34,424 10,370
Common units                            
Partnership equity and distributions                            
Distributions | $ $ 59,695 $ 55,753 $ 75   $ 50,090 26,901 $ 849 25,059 23,556 22,048     $ 165,613 98,413
Limited Partner (Subordinated units) | Limited Partner (Common units)                            
Partnership equity and distributions                            
Distributions | $           $ 20,124   $ 18,985 $ 17,846 $ 16,708       $ 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