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Organization and Summary of Significant Accounting Policies - Fair value (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value of Financial Instruments |  |  |
Debt instrument, Carrying Value | $ 2,216.7 | $ 2,163.2 |
3.75% senior subordinated notes due 2020 |  |  |
Fair Value of Financial Instruments |  |  |
Interest rate (as a percent) | 3.75% | 3.75% |
Debt instrument, Carrying Value | $ 297.9 | $ 296.5 |
3.75% senior subordinated notes due 2020 | Fair Value, Inputs, Level 2 |  |  |
Fair Value of Financial Instruments |  |  |
Debt instrument, Carrying Value | 297.9 | 296.5 |
Debt instrument, Fair Value | $ 291.9 | $ 301.7 |
5.75% senior subordinated notes due 2022 |  |  |
Fair Value of Financial Instruments |  |  |
Interest rate (as a percent) | 5.75% | 5.75% |
Debt instrument, Carrying Value | $ 546.8 | $ 545.9 |
5.75% senior subordinated notes due 2022 | Fair Value, Inputs, Level 2 |  |  |
Fair Value of Financial Instruments |  |  |
Debt instrument, Carrying Value | 546.8 | 545.9 |
Debt instrument, Fair Value | $ 537.6 | $ 562.3 |
5.375% senior subordinated notes due 2024 |  |  |
Fair Value of Financial Instruments |  |  |
Interest rate (as a percent) | 5.375% | 5.375% |
Debt instrument, Carrying Value | $ 297.6 | $ 297.2 |
5.375% senior subordinated notes due 2024 | Fair Value, Inputs, Level 2 |  |  |
Fair Value of Financial Instruments |  |  |
Debt instrument, Carrying Value | 297.6 | 297.2 |
Debt instrument, Fair Value | $ 278.7 | $ 300.2 |
5.50% senior subordinated notes due 2026 |  |  |
Fair Value of Financial Instruments |  |  |
Interest rate (as a percent) | 5.50% | 5.50% | 5.50%
Debt instrument, Carrying Value | $ 495.1 | $ 494.4 |
5.50% senior subordinated notes due 2026 | Fair Value, Inputs, Level 2 |  |  |
Fair Value of Financial Instruments |  |  |
Debt instrument, Carrying Value | 495.1 | 494.4 |
Debt instrument, Fair Value | 465.2 | 505.0 |
Mortgage facilities |  |  |
Fair Value of Financial Instruments |  |  |
Debt instrument, Carrying Value | 289.6 | 235.5 |
Mortgage facilities | Fair Value, Inputs, Level 2 |  |  |
Fair Value of Financial Instruments |  |  |
Debt instrument, Carrying Value | 289.6 | 235.5 |
Debt instrument, Fair Value | $ 290.2 | $ 233.4 |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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