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Guarantor Subsidiaries Financial Information - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items] |  |
Net cash (used for) provided by operating activities | $ 67,904 | $ (13,703)
Net cash used for investing activities | (69,100) | (884,629)
Net cash provided by (used for) financing activities | 22,764 | 41,590
Effect of changes in currency exchange rates | (9,395) | 42,032
Increase (Decrease) in cash | 12,173 | (814,710)
Cash, cash equivalents and restricted cash, beginning of period | 233,401 | 1,143,232
Cash and cash equivalents, end of period | 245,574 | 328,522
Elimination |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash (used for) provided by operating activities | (47,713) | (13,541)
Net cash used for investing activities | 0 | 0
Net cash provided by (used for) financing activities | 47,713 | 13,541
Effect of changes in currency exchange rates | 0 | 0
Increase (Decrease) in cash | 0 | 0
Cash, cash equivalents and restricted cash, beginning of period | 0 | 0
Cash and cash equivalents, end of period | 0 | 0
Parent |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash (used for) provided by operating activities | (116,378) | (50,070)
Net cash used for investing activities | (9,669) | (8,670)
Net cash provided by (used for) financing activities | 125,855 | 58,408
Effect of changes in currency exchange rates | 0 | 0
Increase (Decrease) in cash | (192) | (332)
Cash, cash equivalents and restricted cash, beginning of period | 933 | 2,522
Cash and cash equivalents, end of period | 741 | 2,190
Guarantors |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash (used for) provided by operating activities | 72,206 | 65,857
Net cash used for investing activities | (249) | (1,705)
Net cash provided by (used for) financing activities | (72,009) | (62,148)
Effect of changes in currency exchange rates | 0 | 0
Increase (Decrease) in cash | (52) | 2,004
Cash, cash equivalents and restricted cash, beginning of period | 625 | 1,226
Cash and cash equivalents, end of period | 573 | 3,230
Non-Guarantors |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash (used for) provided by operating activities | 159,789 | (15,949)
Net cash used for investing activities | (59,182) | (874,254)
Net cash provided by (used for) financing activities | (78,795) | 31,789
Effect of changes in currency exchange rates | (9,395) | 42,032
Increase (Decrease) in cash | 12,417 | (816,382)
Cash, cash equivalents and restricted cash, beginning of period | 231,843 | 1,139,484
Cash and cash equivalents, end of period | $ 244,260 | $ 323,102

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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) from financing activities, including 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 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 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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