RESTRICTED INVESTMENTS AND BOND COLLATERAL (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Restricted Investments and Bond Collateral [Abstract]

Components of restricted investments and bond collateral

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

	December 31,
	2014		2013
	(In thousands)
Coal - U.S. Segment:
WML debt reserve account	$	—	$	13,067
Reclamation bond collateral:
Kemmerer Mine	25,282		24,966
Absaloka Mine	11,781		11,653
Rosebud Mine	3,145		3,145
Beulah Mine	1,270		1,270
Buckingham acquisition escrow	34,000		—
Coal - Canada Segment:
PMRU	18,199		—
CVRI	31,866		—
Coal - WMLP Segment:
WMLP	10,634		—
Power Segment:
Letter of credit account	—		5,998
Power contract collateral	12,600		—
Corporate Segment:
Postretirement medical benefit bonds	8,780		8,467
Workers’ compensation bonds	6,832		6,667
Total restricted investments and bond collateral	164,389		75,233
Less current portion	—		(5,998		)
Total restricted investments and bond collateral, less current portion	$	164,389	$	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 December 31, 2014 are as follows:

	Carrying Value		Fair Value
	(In thousands)
Cash and cash equivalents	$	127,881	$	127,881
Time deposits	2,451		2,451
Available-for-sale	34,057		34,057
	$	164,389	$	164,389

Amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities

The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:

	December 31,
	2014		2013
	(In thousands)
Amortized cost	$	—	$	32,184
Gross unrealized holding gains	—		309
Gross unrealized holding losses	—		(447		)
Fair value	$	—	$	32,046

The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:

	December 31,
	2014		2013
	(In thousands)
Amortized cost	$	—	$	11,396
Gross unrealized holding gains	—		764
Gross unrealized holding losses	—		(74		)
Fair value	$	—	$	12,086

Cost basis, gross unrealized holding gains and fair value of available-for-sale securities

The cost basis, gross unrealized holding gains and fair value of available-for-sale securities are as follows:

	December 31,
	2014			2013
	(In thousands)
Cost basis	$	33,879		$	—
Gross unrealized holding gains	761			—
Gross unrealized holding losses	(583		)	—
Fair value	$	34,057		$	—

Maturities of available-for-sale

Maturities of available-for-sale securities were as follows at December 31, 2014:

	Amortized Cost		Fair Value
	(In thousands)
Due within one year	$	327	$	331
Due in five years or less	13,961		13,996
Due after five years to ten years	11,323		11,440
Due in more than ten years	8,268		8,290
	$	33,879	$	34,057

Maturities of available-for-sale securities are as follows at December 31, 2014:

	Cost		Fair Value
	(In thousands)
Within one year	$	452	$	475
Due in five years or less	17,142		17,282
Due after five years to ten years	7,142		7,183
Due in more than ten years	8,194		8,448
	$	32,930	$	33,388