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Organization and Summary of Significant Accounting Policies - Adjustments to Opening Balance Sheet (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment to retained earnings   $ (869,813) $ (559,590) $ (543,495) $ (488,927) $ (480,539) $ (467,324)
Impact of Adoption of Topic 326 on opening balance sheet              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment, income taxes $ 200            
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment to retained earnings       $ 640      
Cumulative Effect, Period of Adoption, Adjustment | Impact of Adoption of Topic 326 on opening balance sheet              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment to retained earnings $ 600