Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Trading equity securities [Abstract]
SERP money market fund	$ 996	$ 989
SERP mutual funds	1,835	1,732
Preferred stocks	720	441
Trading debt securities [Abstract]
Corporate bonds	4,251	3,887
Municipal bonds	2,406	3,091
Floating rate notes	749	330
U.S. Treasury bill	200	250
Other government bonds	409	343
Derivative financial instruments		307
Total financial assets	11,566	11,370
Financial Liabilities [Abstract]
SERP liabilities	6,674	6,076
Derivative financial instruments	145	50
Total financial liabilities	6,819	6,126
Level 1 [Member]
Trading equity securities [Abstract]
SERP money market fund	996	989
SERP mutual funds	1,835	1,732
Preferred stocks	720	441
Trading debt securities [Abstract]
Corporate bonds	3,342	1,649
Municipal bonds	1,449	211
Floating rate notes	749	97
U.S. Treasury bill	200	250
Other government bonds	0	0
Derivative financial instruments		0
Total financial assets	9,291	5,369
Financial Liabilities [Abstract]
SERP liabilities	0	0
Derivative financial instruments	0	0
Total financial liabilities	0	0
Level 2 [Member]
Trading equity securities [Abstract]
SERP money market fund	0	0
SERP mutual funds	0	0
Preferred stocks	0	0
Trading debt securities [Abstract]
Corporate bonds	909	2,238
Municipal bonds	957	2,880
Floating rate notes	0	233
U.S. Treasury bill	0	0
Other government bonds	409	343
Derivative financial instruments		307
Total financial assets	2,275	6,001
Financial Liabilities [Abstract]
SERP liabilities	6,674	6,076
Derivative financial instruments	145	50
Total financial liabilities	6,819	6,126
Level 3 [Member]
Trading equity securities [Abstract]
SERP money market fund	0	0
SERP mutual funds	0	0
Preferred stocks	0	0
Trading debt securities [Abstract]
Corporate bonds	0	0
Municipal bonds	0	0
Floating rate notes	0	0
U.S. Treasury bill	0	0
Other government bonds	0	0
Derivative financial instruments		0
Total financial assets	0	0
Financial Liabilities [Abstract]
SERP liabilities	0	0
Derivative financial instruments	0	0
Total financial liabilities	$ 0	$ 0

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Floating rate notes fair value disclosure.

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Municipal bonds fair value disclosure.

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US Treasury bill fair value disclosure.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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