Annual report pursuant to Section 13 and 15(d)

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

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SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes (Descriptors) (Details) - Senior Notes [Member] - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2015
Apr. 30, 2012
Dec. 31, 2010
4.50% senior notes due 2018 [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated rate     4.50%        
7.15% senior notes due 2020 [Member]              
Debt Instrument [Line Items]              
Senior and convertible senior notes, gross $ 0 $ 300,711,000          
Aggregate Principal             $ 200,000,000.0
Debt instrument, stated rate 7.15% 7.15%         7.15%
Unamortized premium   $ 711,000          
7.00% senior notes due 2022 [Member]              
Debt Instrument [Line Items]              
Senior and convertible senior notes, gross $ 300,000,000 $ 300,000,000          
Aggregate Principal           $ 300,000,000.0  
Debt instrument, stated rate 7.00% 7.00%       7.00%  
6.00% senior notes due 2025 [Member]              
Debt Instrument [Line Items]              
Senior and convertible senior notes, gross [1] $ 404,432,000 $ 405,318,000          
Aggregate Principal $ 400,000,000.0       $ 200,000,000.0    
Debt instrument, stated rate 6.00% 6.00%     6.00%    
Unamortized premium $ 4,432,000 $ 0          
5.125% senior notes due 2027 [Member]              
Debt Instrument [Line Items]              
Senior and convertible senior notes, gross $ 300,000,000 $ 300,000,000          
Aggregate Principal       $ 300,000,000.0      
Debt instrument, stated rate 5.125% 5.125%   5.125%      
[1] $200.0 million of the total $400.0 million of 6.00% Senior Notes due 2025 outstanding at December 31, 2019 was issued at par and had no unamortized premium.