Annual report pursuant to Section 13 and 15(d)

Composition of Certain Financial Statement Captions - Narrative (Details)

v3.8.0.1
Composition of Certain Financial Statement Captions - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Summary of Significant Accounting Policies [Line Items]      
Indefinite-lived intangible assets (excluding goodwill) $ 647,347 $ 644,713  
Scenario, Adjustment      
Summary of Significant Accounting Policies [Line Items]      
Indefinite-lived intangible assets (excluding goodwill)   $ (187,600) $ (187,600)
Finite-Lived Intangible Assets | Scenario, Adjustment      
Summary of Significant Accounting Policies [Line Items]      
Indefinite-lived intangible assets (excluding goodwill)     $ 187,600