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Fair Value of Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Fair Value of Financial Instruments [Abstract]
Fair value of investments in rabbi trust	$ 12,771		$ 12,771		$ 10,037
Investment maturity term	2 years		2 years
Unrealized gains on investments held in rabbi trust	$ 289	$ 242	$ 427	$ 151

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Investment maturity term

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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