RESTRICTED INVESTMENTS, RECLAMATION DEPOSITS AND BOND COLLATERAL (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure Restricted Investments and Bond Collateral [Abstract]

Carrying value and estimated fair value of restricted investments and bond collateral

The Company’s carrying value and estimated fair value of Restricted investments, reclamation deposits and bond collateral as of June 30, 2018 were as follows:

	Restricted Investments and Bond Collateral		Reclamation Deposits		Total Restricted Investments, Reclamation Deposits and Bond Collateral
	(In thousands)
Cash and cash equivalents	$	47,900	$	9,782	$	57,682
Time deposits	2,475		—		2,475
Available-for-sale debt securities	75,644		70,011		145,655
	$	126,019	$	79,793	$	205,812

The Company’s carrying value and estimated fair value of Restricted investments, reclamation deposits and bond collateral as of December 31, 2017 were as follows:

	Restricted Investments and Bond Collateral		Reclamation Deposits		Total Restricted Investments, Reclamation Deposits and Bond Collateral
	(In thousands)
Cash and cash equivalents	$	42,549	$	6,643	$	49,192
Time deposits	2,467		—		2,467
Available-for-sale debt securities	78,157		70,378		148,535
	$	123,173	$	77,021	$	200,194

Amortized cost, gross unrealized holding gains and losses and fair value of available-for-sale securities

The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale debt securities as of June 30, 2018 were as follows:

	Restricted Investments and Bond Collateral			Reclamation Deposits			Total Restricted Investments, Reclamation Deposits and Bond Collateral
	(In thousands)
Cost basis	$	76,281		$	70,255		$	146,536
Gross unrealized holding gains	465			696			1,161
Gross unrealized holding losses	(1,102		)	(940		)	(2,042		)
Fair value	$	75,644		$	70,011		$	145,655

The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale debt securities as of December 31, 2017 were as follows:

	Restricted Investments and Bond Collateral			Reclamation Deposits			Total Restricted Investments, Reclamation Deposits and Bond Collateral
	(In thousands)
Cost basis	$	78,564		$	70,576		$	149,140
Gross unrealized holding gains	521			617			1,138
Gross unrealized holding losses	(928		)	(815		)	(1,743		)
Fair value	$	78,157		$	70,378		$	148,535