FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

A rollforward of our Level 3 liability measured at fair value on a recurring basis follows (in thousands).

Level 3 liability, January 1, 2018	$	362,959
Change in fair value		53,759
Level 3 liability, September 30, 2018	$	416,718

Summary of the estimated fair value of debt instruments

A summary of the estimated fair value of our debt financial instruments follows.

	September 30, 2018				December 31, 2017
	Carrying value		Estimated fair value (Level 2)		Carrying value		Estimated fair value (Level 2)
	(In thousands)
Summit Holdings 5.5% Senior Notes ($300.0 million     principal)	$	297,470	$	300,000	$	297,090	$	301,750
Summit Holdings 5.75% Senior Notes ($500.0 million     principal)		493,843		481,250		493,102		501,667