RESTRICTED INVESTMENTS AND BOND COLLATERAL (Tables)

3 Months Ended

Mar. 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:

	March 31, 2014			December 31, 2013
	(In thousands)
Coal Segment:
WML debt reserve account	$	13,068		$	13,067
Reclamation bond collateral:
Kemmerer Mine	24,944			24,966
Absaloka Mine	11,670			11,653
Rosebud Mine	3,145			3,145
Beulah Mine	1,270			1,270
Power Segment:
Letter of credit account	—			5,998
Corporate Segment:
Proceeds from the New Notes held in escrow	454,219			—
Other requirements for Sherritt Acquisition held in escrow	16,900			—
Postretirement medical benefit bonds	8,481			8,467
Workers’ compensation bonds	6,686			6,667
Total restricted investments and bond collateral	540,383			75,233
Less current portion	(16,900		)	(5,998		)
Total restricted investments and bond collateral, less current portion	$	523,483		$	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 March 31, 2014 are as follows:

	Carrying Value		Fair Value
	(In thousands)
Cash and cash equivalents	$	503,391	$	503,391
Time deposits	2,444		2,444
Held-to-maturity securities	34,548		34,707
	$	540,383	$	540,542

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

The amortized cost, gross unrealized holding gains and fair value of held-to-maturity securities at March 31, 2014 is as follows (in thousands):

Amortized cost	$	34,548
Gross unrealized holding gains	440
Gross unrealized holding losses	(281		)
Fair value	$	34,707

Restricted Investments and Bond Collateral [Member]

Schedule of Held-to-maturity Securities [Line Items]

Maturities of held-to-maturity securities

Maturities of held-to-maturity securities are as follows at March 31, 2014:

	Amortized Cost		Fair Value
	(In thousands)
Due within one year	$	1,193	$	1,217
Due in five years or less	19,539		19,752
Due after five years to ten years	6,718		6,717
Due in more than ten years	7,098		7,021
	$	34,548	$	34,707