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Partners' Equity, Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Incentive Distribution Made to Managing Member or General Partner [Line Items]                      
Partners' Capital, Distribution Amount Per Share $ 0               $ 0    
Incentive Distribution, Date Feb. 14, 2017                    
Distribution Made to Limited Partner, Date of Record Feb. 06, 2017                    
Distribution of Available Cash to Unitholders, Period                 45 days    
Partner Distributions                      
General partner interest in distribution                 $ 4,088 $ 3,563 $ 3,264
General partner incentive distribution                 54,008 40,401 33,221
Total general partner distribution                 58,096 43,964 36,485
Limited partner distribution                 143,796 129,192 121,714
Total regular quarterly cash distribution                 $ 201,892 $ 173,156 $ 158,199
Cash distribution per unit applicable to limited partners $ 0.6075 $ 0.5950 $ 0.5850 $ 0.5750 $ 0.5650 $ 0.5550 $ 0.5450 $ 0.5375 $ 2.3625 $ 2.2025 $ 2.0750
Minimum Quarterly Distribution Percentage [Member]                      
Incentive Distribution Made to Managing Member or General Partner [Line Items]                      
Partners Capital, Distribution Amount per share Minimum                 $ 0.250    
General Partners Capital, Distribution Amount per share                 2.00%    
Partners Capital Distribution percentage                 98.00%    
First Target Distribution [Member]                      
Incentive Distribution Made to Managing Member or General Partner [Line Items]                      
Partners Capital, Distribution Amount per share Maximum                 $ 0.275    
General Partners Capital, Distribution Amount per share                 2.00%    
Partners Capital Distribution percentage                 98.00%    
Second Distribution Target [Member]                      
Incentive Distribution Made to Managing Member or General Partner [Line Items]                      
Partners Capital, Distribution Amount per share Minimum                 $ 0.275    
Partners Capital, Distribution Amount per share Maximum                 $ 0.3125    
General Partners Capital, Distribution Amount per share                 15.00%    
Partners Capital Distribution percentage                 85.00%    
Third Target Distribution [Member]                      
Incentive Distribution Made to Managing Member or General Partner [Line Items]                      
Partners Capital, Distribution Amount per share Minimum                 $ 0.3125    
Partners Capital, Distribution Amount per share Maximum                 $ 0.375    
General Partners Capital, Distribution Amount per share                 25.00%    
Partners Capital Distribution percentage                 75.00%    
Thereafter Target Distribution [Member]                      
Incentive Distribution Made to Managing Member or General Partner [Line Items]                      
Partners Capital, Distribution Amount per share Minimum                 $ 0.375    
General Partners Capital, Distribution Amount per share                 50.00%    
Partners Capital Distribution percentage                 50.00%