Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investments in Marketable Securities as Available for Sale

Our investments in marketable securities are classified as available for sale and are summarized as follows:

	December 31, 2015
	Amortized Cost		Unrealized Gain (Loss)			Market Value
	(In thousands)
Corporate bonds	$	16,480	$	(5,042	)	$	11,438
Mortgage-backed securities		77		3			80
Total	$	16,557	$	(5,039	)	$	11,518

	December 31, 2014
	Amortized Cost		Unrealized Gain (Loss)			Market Value
	(In thousands)
Corporate bonds	$	16,003	$	(104	)	$	15,899
Mortgage-backed securities		130		4			134
Total	$	16,133	$	(100	)	$	16,033

Summary of Proceeds from Sales and Maturities of Marketable Securities and Gross Realized Gains and Losses

Proceeds from maturities and sales of marketable securities and gross realized gains and losses are summarized as follows:

	Year Ended December 31,
	2015		2014		2013
	(In thousands)
Proceeds from maturities	$	—	$	8,000,000	$	4,650,000
Proceeds from sales		51		57		85