Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2011

Intangible Assets [Abstract]

Intangible Assets

	September 30, 2011
	Weighted
	Average		Gross
	Amortization		Carrying		Accumulated
	Period		Amount		Amortization			Net
	(In years)				(In thousands)
Rights-of-way and easements		19	$	130,217	$	(27,420	)	$	102,797
Contracts		17		108,416		(34,546	)		73,870
Customer relationships		11		4,864		(1,539	)		3,325
Total		18	$	243,497	$	(63,505	)	$	179,992

	December 31, 2010
	Weighted
	Average		Gross
	Amortization		Carrying		Accumulated
	Period		Amount		Amortization			Net
	(In years)				(In thousands)
Rights-of-way and easements		20	$	125,496	$	(23,234	)	$	102,262
Contracts		18		107,916		(25,153	)		82,763
Customer relationships		12		4,864		(1,304	)		3,560
Total		19	$	238,276	$	(49,691	)	$	188,585