FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Estimated fair values of Company's debt

The estimated fair values of the Company’s debt with fixed interest rates are as follows:

	Carrying Value		Fair Value
	(In thousands)
December 31, 2013	$	328,473	$	364,329
March 31, 2014	$	777,670	$	823,603

The estimated fair value of the Company’s debt with fixed interest rates are as follows:

	Carrying Value		Fair Value
	(In thousands)
December 31, 2012	$	345,408	$	359,753
December 31, 2013	$	328,473	$	364,329

Summary of financial assets at fair value

The table below sets forth, by level, the Company’s financial assets and liabilities that are accounted for at fair value on a recurring basis:

	Year Ended December 31, 2012
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Available-for-sale investments included in Restricted investments and bond collateral	$	191	$	—	$	—	$	191
Available-for-sale investments included in Reclamation deposits	1,039		—		—		1,039
Total assets	$	1,230	$	—	$	—	$	1,230