INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2013

INVESTMENTS

Summary of amortized cost, unrealized gains and estimated fair values of available-for-sale securities

	December 31,
	2013		2012
	(in thousands)
U.S. Treasury Bonds, stripped of interest, maturing 2020 and 2022, aggregate par value of $1.6 million and $1.6 million, respectively
Amortized cost	$	1,004	$	943
Gross unrealized gains		310		472
Estimated fair value	$	1,314	$	1,415

Schedule of amortized cost and estimated fair values of available-for-sale securities, by contractual maturity

	Amortized cost		Estimated fair value
	(in thousands)
Due within one year	$	100	$	131
Due after one year through five years		—		—
Due after five years through ten years		904		1,183
Due after ten years		—		—
Total	$	1,004	$	1,314