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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures
Marketable Securities	$ 95,313	$ 128,120
Recurring basis \| Fair Value Measurement Using: Level 1
Fair Value Disclosures
Marketable Securities	81,042	111,725
Total assets	81,042	111,725
Recurring basis \| Fair Value Measurement Using: Level 2
Fair Value Disclosures
Marketable Securities	2,072	2,929
Total assets	2,072	2,929
Recurring basis \| Fair Value Measurement Using: Level 3
Fair Value Disclosures
Marketable Securities	952	991
Total assets	952	991
Recurring basis \| Assets at Fair Value
Fair Value Disclosures
Marketable Securities	84,066	115,645
Total assets	$ 84,066	$ 115,645

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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