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Notes Payable - Note Repayment (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Debt |  |  |  |
Principal payments on notes payable |  | $ 350,000 | $ 175,000 |
Notes Payable | 2.000% notes, issued in October 2012 and due in January 2018 |  |  |  |
Debt |  |  |  |
Principal payments on notes payable | $ 350,000 |  |  |
Stated interest rate (as a percent) | 2.00% | 2.00% |  | 2.00%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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