RESTRICTED INVESTMENTS AND BOND COLLATERAL (Tables)

9 Months Ended

Sep. 30, 2014

Schedule of Available-for-sale Securities [Line Items]

Components of restricted investments and bond collateral

The Company’s restricted investments and bond collateral consist of the following:

	September 30, 2014		December 31, 2013
	(In thousands)
Coal - U.S. Segment:
WML debt reserve account	$	—	$	13,067
Reclamation bond collateral:
Kemmerer Mine	25,544		24,966
Absaloka Mine	11,775		11,653
Rosebud Mine	3,145		3,145
Beulah Mine	1,270		1,270
Coal - Canada Segment:
PMRU	16,203		—
CVRI	31,867		—
Power Segment:
Restricted investments	3,400		5,998
Corporate Segment:
Postretirement medical benefit bonds	8,707		8,467
Workers’ compensation bonds	6,823		6,667
Total restricted investments and bond collateral	108,734		75,233
Less current portion	—		(5,998		)
Total restricted investments and bond collateral, less current portion	$	108,734	$	69,235

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

The Company’s carrying value and estimated fair value of its restricted investments and bond collateral at September 30, 2014 were as follows:

	Carrying Value		Fair Value		Fair Value Hierarchy
	(In thousands)
Cash and cash equivalents	$	71,164	$	71,164	Level 1
Time deposits	2,451		2,451		Level 1
Available-for-sale	35,119		35,119		Level 1
	$	108,734	$	108,734

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 securities at September 30, 2014 were as follows (in thousands):

Cost basis	$	34,538
Gross unrealized holding gains	643
Gross unrealized holding losses	(62		)
Fair value	$	35,119

Restricted Investments and Bond Collateral [Member]

Schedule of Available-for-sale Securities [Line Items]

Investments Classified by Contractual Maturity Date [Table Text Block]

Maturities of available-for-sale securities were as follows at September 30, 2014:

	Amortized Cost		Fair Value
	(In thousands)
Due within one year	$	1,097	$	1,106
Due in five years or less	14,245		14,504
Due after five years to ten years	8,872		9,106
Due in more than ten years	10,324		10,403
	$	34,538	$	35,119