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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Basis of Presentation and Summary of Significant Accounting Policies |
Schedule of aggregate principal amount and fair value | The following table summarizes the aggregate principal amount and fair value of our Senior Notes 2026 and Senior Notes 2027 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2019 | ​ | December 31, 2018
​ | ​ | Level 2 | ​ | Level 2
Senior Notes 2026, aggregate principal | ​ | $ | 725,000 | ​ | $ | 725,000
Fair value of Senior Notes 2026 | ​ | ​ | 750,375 | ​ | ​ | 696,000
Senior Notes 2027, aggregate principal | ​ | $ | 750,000 | ​ | $ | —
Fair value of Senior Notes 2027 | ​ | ​ | 774,375 | ​ | ​ | —
Schedule of impact of adoption of ASC Topic 842 | Cumulative-effect adjustments made to the opening balance sheet at January 1, 2019 were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Balance at | ​ | Adjustments Due to | ​ | ​
​ | ​ | Balance Sheet | ​ | December 31, 2018, as | ​ | ASC Topic 842 | ​ | Balance at
Assets (liabilities) | ​ | Line Item | ​ | Previously Reported | ​ | (Leases) | ​ | January 1, 2019
Operating lease right-of-use assets | ​ | Other assets | ​ | $ | — | ​ | $ | 3,502 | ​ | $ | 3,502
Operating lease liabilities, current | ​ | Accrued liabilities | ​ | ​ | — | ​ | ​ | (2,015) | ​ | ​ | (2,015)
Operating lease liabilities, long-term | ​ | Other liabilities | ​ | ​ | — | ​ | ​ | (1,706) | ​ | ​ | (1,706)

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
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