Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value of Financial Instruments [Abstract]

Amortized Cost and Fair Value of Investments

The amortized cost and fair value of these investments were as follows (in thousands):

	December 31, 2011							December 31, 2010
	Cost or Amortized Cost		Net Unrealized Gain (Loss)			Fair Value		Cost or Amortized Cost		Net Unrealized Gain (Loss)			Fair Value
Debt	$	7,150	$	(1,050	)	$	6,100	$	7,150	$	(450	)	$	6,700
Equity(1)		2,000		400			2,400		2,000		(100	)		1,900
Total	$	9,150	$	(650	)	$	8,500	$	9,150	$	(550	)	$	8,600

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(1)  As of December 31, 2011 and 2010, the amortized cost and fair values of the two preferred stock investments were $0.

Changes in Fair Value of Investments

The changes in fair value of the investments were as follows (in thousands):

	Years Ended December 31,
	2011			2010
Debt Securities
Fair value at beginning of period	$	6,700		$	10,900
Temporary impairment (charges) credits, net		(600	)		50
Other-than-temporary impairment charges		—			(850	)
Sale of security		—			(3,400	)
Net change in fair value		(600	)		(4,200	)
Fair value at end of period	$	6,100		$	6,700
Equity Securities
Fair value at beginning of period	$	1,900		$	2,200
Temporary impairment credits (charges), net		500			(300	)
Net change in fair value		500			(300	)
Fair value at end of period	$	2,400		$	1,900
Total
Fair value at beginning of period	$	8,600		$	13,100
Temporary impairment charges, net		(100	)		(250	)
Other-than-temporary impairment charges		—			(850	)
Sale of security		—			(3,400	)
Net change in fair value		(100	)		(4,500	)
Fair value at end of period	$	8,500		$	8,600