FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of fair value of the Company's financial assets and liabilities

The following tables set forth by level within the fair value hierarchy the Company's financial assets and liabilities that were accounted for at fair value as of June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018
	Level 1		Level 2		Level 3		Total
Assets
Receivables from derivative contracts	$	—	$	20,837	$	—	$	20,837


Liabilities
Liabilities from derivative contracts	$	—	$	74,486	$	—	$	74,486

	December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets
Receivables from derivative contracts	$	—	$	677	$	—	$	677


Liabilities
Liabilities from derivative contracts	$	—	$	26,999	$	—	$	26,999

Schedule of the estimated fair values of the Company's fixed interest rate debt instruments

The following table presents the estimated fair values of the Company's fixed interest rate debt instruments as of June 30, 2018 and December 31, 2017 (excluding discounts, premiums and debt issuance costs) (in thousands):

	June 30, 2018				December 31, 2017
Debt	Principal Amount		Estimated Fair Value		Principal Amount		Estimated Fair Value
6.75% senior notes	$	625,005	$	584,380	$	425,005	$	443,790