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Condensed Consolidating Financial Statements (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Subsidiaries, ownership percentage | 100.00%

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- Definition The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611443-123010 + Details
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