Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2012

Investments, Debt and Equity Securities [Abstract]

Summary of Company's investment in marketable securities

The following tables summarize the Company's investment in marketable securities:

	Common Stock				Preferred Stock				Total Available-for-Sale Securities
As of September 30, 2012:
Fair value	$	573			$	8,774			$	9,347
Amortized cost basis	1,472				11,472				12,944
Total other-than-temporary impairment recognized	(972		)		(9,665		)		(10,637		)
Adjusted cost basis	500				1,807				2,307
Net gains in accumulated other comprehensive income (OCI)	90				6,967				7,057
Net losses in accumulated OCI	(17		)	(a)	—				(17		)
As of December 31, 2011:
Fair value	$	11,550			$	18,835			$	30,385
Amortized cost basis	28,997				38,242				67,239
Total other-than-temporary impairment recognized	(23,889		)		(31,308		)		(55,197		)
Adjusted cost basis	5,108				6,934				12,042
Net gains in accumulated OCI	6,615				11,942				18,557
Net losses in accumulated OCI	(173		)	(b)	(41		)	(c)	(214		)

(a) This amount represents the gross unrealized losses of one common stock security with a fair value of $402 as of September 30, 2012. This security had been in a continuous unrealized loss position for less than 12 months as of September 30, 2012.

(b) This amount represents the gross unrealized losses of one common stock security with a fair value of $765 as of December 31, 2011. This security had been in a continuous unrealized loss position for less than 12 months as of December 31, 2011.

(c) This amount represents the gross unrealized losses of one preferred stock security with a fair value of $130 as of December 31, 2011. This security had been in a continuous unrealized loss position for less than 12 months as of December 31, 2011.

Summary of activity related to Company's marketable securities

The following table summarizes activity related to the Company's marketable securities:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2012		2011			2012		2011
Net unrealized OCI gain (loss)	$	1,426	$	(6,240	)	$	5,070	$	(3,843	)
Net gain on sales and redemptions of securities	$	9,108	$	—		$	16,373	$	277