XML 61 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Basis of Presentation and Summary of Significant Accounting Policies - Fair Value (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Long-term debt, aggregate principal $ 725,000
Level 2 | Carrying amount  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Assets 709,511
Level 2 | Fair value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Assets $ 696,000