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Fair Value of Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Fair Value of Financial Instruments [Abstract]
Fair value of investments in rabbi trust	$ 15,649		$ 15,649		$ 13,397
Investment maturity term			2 years
Unrealized gains (losses) on investments held in rabbi trust	$ 292	$ (147)	$ 436	$ 138

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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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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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