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Leases (Schedule of Maturity of Lease Liabilities) (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Leases [Abstract] |  |
Operating Leases, 2019 | $ 164,979 | [1]
Operating Leases, 2020 | 109,790 | [1]
Operating Leases, 2021 | 58,415 | [1]
Operating Leases, 2022 | 53,639 | [1]
Operating Leases, 2023 | 53,140 | [1]
Operating Leases, Remaining | 465,611 | [1]
Operating Leases, Total future minimum payments | 905,574 | [1]
Finance Leases, 2019 | 801 |
Finance Leases, 2020 | 1,069 |
Finance Leases, 2021 | 1,069 |
Finance Leases, 2022 | 1,069 |
Finance Leases, 2023 | 1,069 |
Finance Leases, Remaining | 5,610 |
Finance Leases, Total future minimum payments | 10,687 |
Total Leases, 2019 | 165,780 |
Total Leases, 2020 | 110,859 |
Total Leases, 2021 | 59,484 |
Total Leases, 2022 | 54,708 |
Total Leases, 2023 | 54,209 |
Total Leases, Remaining | 471,221 |
Total Leases, Future minimum payments | 916,261 |
Minimum lease payments for leases signed but not yet commenced | $ 272,200 |
Lease duration for leases signed but not yet commenced | 20 years |
[1] | Excludes $272.2 million of minimum lease payments for leases entered but not yet commenced. These payments relate to an expansion of an existing gas processing plant and payments are anticipated to commence at the end of 2019 for 20 years.

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