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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 07, 2019	Dec. 31, 2018	Mar. 23, 2018
Senior Notes 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 750,375		$ 696,000
Carrying amount	725,000		$ 725,000	$ 725,000
Senior Notes 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	774,375
Carrying amount	$ 750,000	$ 750,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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+ References

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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