Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS

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FAIR VALUE MEASUREMENTS
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS
FAIR VALUE MEASUREMENTS
The Company’s outstanding debt held by third-party financial institutions is carried at cost, adjusted for any discounts or debt issuance costs. The Company’s debt is not publicly traded and the carrying amounts typically approximate fair value for debt that accrues interest at a variable rate, which are considered to be Level 2 inputs as defined in the FASB guidance.
The following table presents the estimated fair values of the Company’s senior notes and convertible senior notes:


Estimated Fair Value at
 
September 30, 2018
 
December 31, 2017
 
Level 2
 
(in thousands)
4.875% Senior Notes due 2024
$
565,967

 
$
592,325

5.625% Senior Notes due 2026
$
303,408

 
$

5.375% Senior Notes due 2022
$
254,043

 
$
259,233

2.5% Convertible Senior Notes due 2023
$
600,875

 
$

2.5% Convertible Senior Notes due 2019
$
45,182

 
$
310,635