Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Narrative) (Details)

v3.7.0.1
Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Deferred finance costs, net $ 31,486 $ 27,174
Senior notes | 6.625% Senior Notes    
Debt Instrument [Line Items]    
Deferred finance costs, net 5,800  
Senior notes | 6.000% Senior Notes due 2024    
Debt Instrument [Line Items]    
Deferred finance costs, net 10,700  
Senior notes | 6.375% Senior Notes due 2025    
Debt Instrument [Line Items]    
Deferred finance costs, net 14,900  
Carry value | Senior notes    
Debt Instrument [Line Items]    
Fair value of notes 1,600,000  
Fair value | Senior notes    
Debt Instrument [Line Items]    
Fair value of notes $ 1,600,000