Annual report pursuant to Section 13 and 15(d)

SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes (Details)

v3.10.0.1
SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes (Details) - Senior Notes [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Net debt issuance costs $ (10,745) $ (9,830)
Senior and convertible senior notes, net 1,295,284 1,266,450
4.50% senior notes due 2018 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, gross 0 175,000
7.15% senior notes due 2020 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, gross 300,711 301,280
7.00% senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, gross 300,000 300,000
6.00% senior notes due 2025 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, gross [1] 405,318 200,000
5.125% senior notes due 2027 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, gross $ 300,000 $ 300,000
[1] (1) $200.0 million of the total $400.0 million of 6.00% Senior Notes due 2025 outstanding at December 31, 2018 was issued at par and had no unamortized premium.