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Partners' Capital and Distributions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2015 | Apr. 10, 2015 | Sep. 26, 2014 | Sep. 16, 2013 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering | 10,350,000 | 4,600,000 | 4,600,000 | 5,750,000 |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ 437,164 | $ 198,168 | $ 225,725 | $ 263,574 |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  |  | 109,979,218 |  |  |  | 95,029,218 |  |  |
Per Unit Amount |  |  |  |  | $ 0.6400 | $ 0.6250 | $ 0.6100 | $ 0.5950 | $ 0.5800 | $ 0.5650 | $ 0.5500 | $ 0.5350
Common units, issued | 10,350,000 | 4,600,000 | 4,600,000 | 5,750,000 | 109,979,218 |  |  |  | 95,029,218 |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  |  | 100.00% |  |  |  |  |  |  |
Days to distribute |  |  |  |  | 45 days |  |  |  |  |  |  |
Price per share of common units issued | $ 43.77 | $ 44.42 | $ 50.71 | $ 47.51 |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units | $ 453,020 | $ 204,332 | $ 233,266 | $ 273,183 |  |  |  |  |  |  |  |
Partners' Capital Account, Costs In Connection With Common Units Issued To The Public | $ (15,856) | $ (6,164) | (7,541) | (9,609) |  |  |  |  |  |  |  |
Limited Partners' Capital Accountant, Option To Purchase | 1,350,000 | 600,000 |  |  |  |  |  |  |  |  |  |
Waiver Units Class 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  |  | 1,738,000 |  |  |  |  |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  |  | 100.00% |  |  |  |  |  |  |
Days to distribute |  |  |  |  | 45 days |  |  |  |  |  |  |
Waiver Units Class 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  |  | 1,738,000 |  |  |  |  |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  |  | 100.00% |  |  |  |  |  |  |
Days to distribute |  |  |  |  | 45 days |  |  |  |  |  |  |
Waiver Units Class4 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  |  | 1,738,000 |  |  |  |  |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  |  | 100.00% |  |  |  |  |  |  |
Days to distribute |  |  |  |  | 45 days |  |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs |  |  | $ 225,700 | $ 263,600 |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  |  | 109,939,221 |  |  |  |  |  |  |
Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  |  | 39,997 |  |  |  |  |  |  |
Class Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  |  | 1.1 |  |  |  |  |  |  |
Class Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  |  | 1.1 |  |  |  |  |  |  |
Class Four [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  |  | 1.1 |  |  |  |  |  |  |

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