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Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 134,001 | $ 95,150 | $ 111,319 | $ 90,090 | $ 156,526 | $ 18,235 | $ 105,936 | $ 154,455 | $ 430,560 | $ 435,152 | $ (979,709)
Foreign currency translation adjustment | [1] |  |  |  |  |  |  |  |  | (15,487) | 12,519 | 2,119
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | (15,487) | 12,519 | 2,119
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 415,073 | 447,671 | (977,590)
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (485,249) | (228,143) | 22,154
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 15,487 | (12,519) | (2,119)
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | 15,487 | (12,519) | (2,119)
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  | (469,762) | (240,662) | 20,035
Parent |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 430,560 | 435,152 | (979,709)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (15,487) | 12,519 | 2,119
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | (15,487) | 12,519 | 2,119
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 415,073 | 447,671 | (977,590)
Guarantors |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 485,762 | 230,335 | 2,999
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (297) | 182 | 778
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | (297) | 182 | 778
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 485,465 | 230,517 | 3,777
Non-Guarantor |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (513) | (2,192) | (25,153)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (15,190) | 12,337 | 1,341
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | (15,190) | 12,337 | 1,341
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  | $ (15,703) | $ 10,145 | $ (23,812)
[1] | Net of $1.3 million in taxes for the year ended December 31, 2016. No taxes were recorded for the years ended December 31, 2018 and December 31, 2017.

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e557-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 + Details
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