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Organization and Summary of Significant Accounting Policies - Merger Transaction Narratives (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 26, 2018 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Business Acquisitions |  |  |  |  |
Ownership percentage held by reporting entity | 57.00% |  |  |  |
Deferred tax asset, net |  | $ 57,200 |  | $ 57,200 |
Deferred tax asset valuation allowance |  | 55,300 |  | 55,300 |
Adjustments to additional paid in capital, deferred tax asset |  |  |  | 101,200 |
Merger-related costs |  | $ 5,686 | $ 0 | $ 9,811 | $ 0
Partnership Merger |  |  |  |  |
Business Acquisitions |  |  |  |  |
Deferred tax asset acquired | $ 156,500 |  |  |  |
Partnership Merger | Common Stock |  |  |  |  |
Business Acquisitions |  |  |  |  |
Business acquisition, shares issued (shares) | shares | 57,600,000.0 |  |  |  |
Business acquisition, shares acquired (shares) | shares | 41.2 |  |  |  |
Share conversion rate (per share) | 1.40 |  |  |  |
Value of shares used as consideration | $ 625,300 |  |  |  |

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