v3.10.0.1

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments: A Consensus of the FASB Emerging Issues Task Force. This ASU includes a requirement to make an accounting policy election to classify distributions received from equity method investees under either (1) the cumulative earnings approach, where distributions in excess of equity earnings are considered a return of capital and classified as cash inflows from investing activities, or (2) the nature of the distribution approach, where each distribution is evaluated on the basis of the source of the payment and classified as either operating or investing cash inflows. We adopted this standard on January 1, 2018 using the retrospective transition method and made an accounting policy election to use the nature of the distribution approach, which resulted in the following adjustments to our December 31, 2016 and 2017 comparative statements of cash flows (in thousands):
|  | Year Ended December 31, 2016 |  | Year Ended December 31, 2017
|  | As Reported |  | ASU 2016-15 Adjustment |  | As Adjusted |  | As Reported |  | ASU 2016-15 Adjustment |  | As Adjusted
Operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Distributions from operations of non-controlled entities |  | $ | 78,723 |  |  | $ | 9,264 |  |  | $ | 87,987 |  |  | $ | 123,660 |  |  | $ | 22,551 |  |  | $ | 146,211 |
Net cash provided by operating activities |  | $ | 964,040 |  |  | $ | 9,264 |  |  | $ | 973,304 |  |  | $ | 1,108,678 |  |  | $ | 22,551 |  |  | $ | 1,131,229 |
Investing activities: |  |  |  |  |  |  |  |  |  |  |  |
Distributions from returns of investments in non-controlled entities |  | $ | 9,264 |  |  | $ | (9,264 | ) |  | $ | — |  |  | $ | 78,482 |  |  | $ | (22,551 | ) |  | $ | 55,931 |
Net cash used by investing activities |  | $ | (857,366 | ) |  | $ | (9,264 | ) |  | $ | (866,630 | ) |  | $ | (570,623 | ) |  | $ | (22,551 | ) |  | $ | (593,174 | )
In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU amends the existing accounting standards for revenue recognition and is based on the principle that revenue should be recognized to depict the transfer of goods or services to a customer at an amount that reflects the consideration a company expects to receive in exchange for those goods or services. On January 1, 2018, we adopted the new Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with Customers and all related amendments using the modified retrospective method. We recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of partners’ capital. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet resulting from the adoption of the new revenue standard was as follows (in thousands):
|  | Balance at December 31, 2017 |  | Adjustments Due to ASU 2014-09 |  | Balance at January 1, 2018
Assets: |  |  |  |  |  |
Property, plant and equipment |  | $ | 7,235,468 |  |  | $ | 8,516 |  |  | $ | 7,243,984 |
Accumulated depreciation |  | (1,682,633 | ) |  | (325 | ) |  | (1,682,958 | )
Net property, plant and equipment |  | $ | 5,552,835 |  |  | $ | 8,191 |  |  | $ | 5,561,026 |
Investments in non-controlled entities |  | $ | 1,082,511 |  |  | $ | 502 |  |  | $ | 1,083,013 |
Liabilities: |  |  |  |  |  |
Deferred revenue |  | $ | 117,795 |  |  | $ | (1,901 | ) |  | $ | 115,894 |
Other noncurrent liabilities |  | $ | 30,350 |  |  | $ | 4,619 |  |  | $ | 34,969 |
Partners’ capital: |  |  |  |  |  |
Limited partner unitholders |  | $ | 2,267,231 |  |  | $ | 5,975 |  |  | $ | 2,273,206 |

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