Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value of Financial Instruments [Abstract]

Summary of carrying amounts and fair values of long-term debt

	March 31, 2013				December 31, 2012
(In Thousands of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Variable rate long-term debt	$	32,229	$	32,229	$	38,087	$	38,087
Fixed rate long-term debt	$	31,429	$	32,763	$	31,429	$	32,818