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GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities | $ 188,811 | $ 450,530 | $ 450,844
Net cash used in investing activities | (275,729) | (775,065) | (380,136)
Net cash provided by (used in) financing activities | (97,431) | 522,971 | (251,498)
Effect of changes in currency exchange rates | 19,266 | (26,143) | (18,868)
(Decrease) increase in cash | (165,083) | 172,293 | (199,658)
Cash, beginning of year | 398,484 | 226,191 | 425,849
Cash, end of year | 233,401 | 398,484 | 226,191
Elimination |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities | (34,028) | (42,138) | (81,787)
Net cash used in investing activities | 0 | 0 | 0
Net cash provided by (used in) financing activities | 34,028 | 42,138 | 81,787
Effect of changes in currency exchange rates | 0 | 0 | 0
(Decrease) increase in cash | 0 | 0 | 0
Cash, beginning of year | 0 | 0 | 0
Cash, end of year | 0 | 0 | 0
Parent |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities | (49,231) | (44,611) | (90,374)
Net cash used in 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
(Decrease) increase in cash | (1,589) | 2,522 | (146,806)
Cash, beginning of year | 2,522 | 0 | 146,806
Cash, end of year | 933 | 2,522 | 0
Guarantors |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities | 249,204 | 332,822 | 487,516
Net cash used in investing activities | (120,661) | (14,725) | (109,326)
Net cash provided by (used in) financing activities | (133,237) | (321,758) | (378,330)
Effect of changes in currency exchange rates | 0 | 0 | 0
(Decrease) increase in cash | (4,694) | (3,661) | (140)
Cash, beginning of year | 9,496 | 13,157 | 13,297
Cash, end of year | 4,802 | 9,496 | 13,157
Non-Guarantors |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities | 22,866 | 204,457 | 135,489
Net cash used in investing activities | (143,912) | 69,443 | (262,948)
Net cash provided by (used in) financing activities | (57,020) | (74,325) | 93,615
Effect of changes in currency exchange rates | 19,266 | (26,143) | (18,868)
(Decrease) increase in cash | (158,800) | 173,432 | (52,712)
Cash, beginning of year | 386,466 | 213,034 | 265,746
Cash, end of year | $ 227,666 | $ 386,466 | $ 213,034

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- Definition 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 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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