Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Summary of Debt) (Details)

v3.8.0.1
Long-Term Debt (Summary of Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Outstanding Principal $ 2,449,886  
Deferred financing costs (3,806) $ 0
Total debt 2,477,806 0
Debt classified as current (included in other current liabilities) (2,971) 0
Total long-term debt 2,474,835 0
Margin Loan    
Debt Instrument [Line Items]    
Outstanding Principal 1,000,000  
Carrying Value 1,000,000
Senior notes    
Debt Instrument [Line Items]    
Outstanding Principal 775,000  
Carrying Value 806,726  
Senior credit facility    
Debt Instrument [Line Items]    
Outstanding Principal 666,968  
Carrying Value 666,968  
Wells Fargo note payable    
Debt Instrument [Line Items]    
Outstanding Principal 7,918  
Carrying Value $ 7,918