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Marketable Securities - Summary of Marketable Securities Treated as Available-for-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	$ 197	$ 197	$ 27,054
Total available-for-sale securities, Gross unrealized gains	220	157	150
Total available-for-sale securities, Gross unrealized losses	0	0	(10)
Total available-for-sale securities, Fair value	417	354	27,194
Common stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	197	197	197
Total available-for-sale securities, Gross unrealized gains	220	157	150
Total available-for-sale securities, Gross unrealized losses	0	0	0
Total available-for-sale securities, Fair value	417	354	347
Government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost			26,857
Total available-for-sale securities, Gross unrealized gains			0
Total available-for-sale securities, Gross unrealized losses			(10)
Total available-for-sale securities, Fair value			$ 26,847

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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