Investment in ATC (Tables)

3 Months Ended

Mar. 31, 2013

Investment in ATC (Tables) [Abstract]

ATC's Summarized Financial Data

		Three Months Ended
		March 31,
(In thousands)		2013		2012
Operating revenues	$	151,737	$	147,662
Operating expenses		(69,770)		(69,566)
Other expense, net		(448)		(500)
Interest expense, net		(21,044)		(19,501)
Earnings before members' income taxes	$	60,475	$	58,095