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GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Cash Flow Statement (FY) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash (used in) provided by operating activities | $ 38,038 | $ 26,511 | $ 188,811 | $ 450,530 | $ 450,844
Net cash (used in) provided by investing activities |  |  | (1,033,474) | (232,966) | (177,194)
Net cash provided by (used in) financing activities |  |  | (97,431) | 522,971 | (251,498)
Effect of changes in currency exchange rates | (27,208) | 34,258 | 32,263 | (26,436) | (18,868)
(Decrease) increase in cash |  |  | (909,831) | 714,099 | (3,284)
Cash, cash equivalents, and restricted cash, beginning of period | 233,401 | 1,143,232 | 1,143,232 | 429,133 | 425,849
Cash, cash equivalents, and restricted cash, end of period | 2,135,381 | 228,080 | 233,401 | 1,143,232 | 429,133
Elimination |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash (used in) provided by operating activities | (73,872) | (26,405) | (30,605) | (43,825) | (62,213)
Net cash (used in) provided by investing activities |  |  | 0 | 0 | 0
Net cash provided by (used in) financing activities |  |  | 30,605 | 43,825 | 62,213
Effect of changes in currency exchange rates | 0 | 0 | 0 | 0 | 0
(Decrease) increase in cash |  |  | 0 | 0 | 0
Cash, cash equivalents, and restricted cash, beginning of period | 0 | 0 | 0 | 0 | 0
Cash, cash equivalents, and restricted cash, end of period | 0 | 0 | 0 | 0 | 0
Parent |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash (used in) provided by operating activities | (111,120) | (38,959) | (49,231) | (44,611) | (90,374)
Net cash (used in) provided by investing activities |  |  | (11,156) | (829,783) | (7,862)
Net cash provided by (used in) financing activities |  |  | 58,798 | 876,916 | (48,570)
Effect of changes in currency exchange rates | 0 | 0 | 0 | 0 | 0
(Decrease) increase in cash |  |  | (1,589) | 2,522 | (146,806)
Cash, cash equivalents, and restricted cash, beginning of period | 933 | 2,522 | 2,522 | 0 | 146,806
Cash, cash equivalents, and restricted cash, end of period | 1,760,805 | 3,049 | 933 | 2,522 | 0
Guarantors |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash (used in) provided by operating activities | 95,503 | 101,597 | 130,298 | 142,839 | 300,965
Net cash (used in) provided by investing activities |  |  | (3,357) | (2,653) | (2,653)
Net cash provided by (used in) financing activities |  |  | (127,542) | (147,586) | (295,133)
Effect of changes in currency exchange rates | 0 | 0 | 0 | 0 | 0
(Decrease) increase in cash |  |  | (601) | (7,400) | 3,179
Cash, cash equivalents, and restricted cash, beginning of period | 625 | 1,226 | 1,226 | 8,626 | 5,447
Cash, cash equivalents, and restricted cash, end of period | 73 | 850 | 625 | 1,226 | 8,626
Non-Guarantors |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash (used in) provided by operating activities | 127,527 | (9,722) | 138,349 | 396,127 | 302,466
Net cash (used in) provided by investing activities |  |  | (1,018,961) | 599,470 | (166,679)
Net cash provided by (used in) financing activities |  |  | (59,292) | (250,184) | 29,992
Effect of changes in currency exchange rates | (27,208) | 34,258 | 32,263 | (26,436) | (18,868)
(Decrease) increase in cash |  |  | (907,641) | 718,977 | (146,911)
Cash, cash equivalents, and restricted cash, beginning of period | 231,843 | 1,139,484 | 1,139,484 | 420,507 | 273,596
Cash, cash equivalents, and restricted cash, end of period | $ 374,503 | $ 224,181 | $ 231,843 | $ 1,139,484 | $ 420,507

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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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