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Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 752,488 | $ 679,889 | $ 337,843
Net cash used in investing activities | (643,091) | (2,474,168) | (720,582)
Net cash (used in) provided by financing activities | (156,657) | 432,961 | 1,730,640
Net (decrease) increase in cash, cash equivalents and restricted cash | (47,260) | (1,361,318) | 1,347,901
Cash, cash equivalents and restricted cash at beginning of period | 99,557 | 1,460,875 | 112,974
Cash, cash equivalents and restricted cash at end of period | 52,297 | 99,557 | 1,460,875
Eliminations |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 1 | 0 | 11,001
Net cash used in investing activities | 2,318 | 1,419,417 | 37,972
Net cash (used in) provided by financing activities | (2,319) | (1,419,417) | (48,973)
Net (decrease) increase in cash, cash equivalents and restricted cash | 0 | 0 | 0
Cash, cash equivalents and restricted cash at beginning of period | 0 | 0 | 0
Cash, cash equivalents and restricted cash at end of period | 0 | 0 | 0
Parent |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 543,817 | 392,680 | 336,330
Net cash used in investing activities | (429,483) | (2,216,615) | (720,582)
Net cash (used in) provided by financing activities | (156,657) | 432,961 | 1,730,640
Net (decrease) increase in cash, cash equivalents and restricted cash | (42,323) | (1,390,974) | 1,346,388
Cash, cash equivalents and restricted cash at beginning of period | 67,908 | 1,458,882 | 112,494
Cash, cash equivalents and restricted cash at end of period | 25,585 | 67,908 | 1,458,882
Guarantors |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 208,670 | 287,209 | (9,486)
Net cash used in investing activities | (213,608) | (1,674,690) | (22,500)
Net cash (used in) provided by financing activities | 0 | 1,417,137 | 33,500
Net (decrease) increase in cash, cash equivalents and restricted cash | (4,938) | 29,656 | 1,514
Cash, cash equivalents and restricted cash at beginning of period | 31,649 | 1,993 | 479
Cash, cash equivalents and restricted cash at end of period | 26,711 | 31,649 | 1,993
Non-Guarantor |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 0 | 0 | (2)
Net cash used in investing activities | (2,318) | (2,280) | (15,472)
Net cash (used in) provided by financing activities | 2,319 | 2,280 | 15,473
Net (decrease) increase in cash, cash equivalents and restricted cash | 1 | 0 | (1)
Cash, cash equivalents and restricted cash at beginning of period | 0 | 0 | 1
Cash, cash equivalents and restricted cash at end of period | $ 1 | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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