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Leases (Present Value of Lease Liabilities) (Details) $ in Thousands | Mar. 31, 2019 USD ($)
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Leases [Abstract] |  |
Operating Leases, Total future minimum payments | $ 905,574 | [1]
Operating Leases, Less imputed interest | (281,613) | [1]
Operating Leases, Present value of lease liabilities | 623,961 | [1],[2]
Finance Leases, Total future minimum payments | 10,687 |
Finance Leases, Less imputed interest | (2,234) |
Finance Leases, Present value of lease liabilities | 8,453 | [2]
Total Leases, Future minimum payments | 916,261 |
Total Leases, Less imputed interest | (283,847) |
Total Leases, Present value of lease liabilities | $ 632,414 | [2]
[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.
[2] | Includes both the current and long-term portion of the lease liabilities.

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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