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SENIOR AND CONVERTIBLE SENIOR NOTES, NET (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Senior and Convertible Senior Notes
Senior and convertible senior notes, net consist of the following (in thousands):
 
 
At December 31,
 
 
2017
 
2016
4.50% senior notes due 2018
 
$
175,000

 
$
175,000

7.15% senior notes due 2020. At December 31, 2017 and December 31, 2016 there was approximately $1,280 and $1,849 in net unamortized premium, respectively
 
301,280

 
301,849

7.00% senior notes due 2022
 
300,000

 
300,000

6.00% senior notes due 2025
 
200,000

 
200,000

5.125% senior notes due 2027
 
300,000

 

1.875% convertible senior notes due 2032
 

 
126,500

Net debt issuance costs
 
(9,830
)
 
(8,230
)
Total
 
$
1,266,450

 
$
1,095,119

Schedule of Principal Maturities of Senior and Senior Convertible Notes
Scheduled principal maturities of our senior and notes as of December 31, 2017 follow (in thousands):
Year Ended December 31,
 
2018
$
175,000

2019

2020
300,000

2021

2022
300,000

Thereafter
500,000

Total
$
1,275,000