
Note 3 —	Intangible Assets

Our intangible assets consisted of the following:


	June 30,			December 31,
	2011			2010
	(In thousands)

Rights-of-way and easements, at cost	$	129,137		$	125,496
Less accumulated amortization for rights-of-way and easements		(26,007	)		(23,234	)
Contracts		108,416			107,916
Less accumulated amortization for contracts		(28,078	)		(25,153	)
Customer relationships		4,864			4,864
Less accumulated amortization for customer relationships		(1,460	)		(1,304	)

Intangible assets, net	$	186,872		$	188,585

During the three and six months ended June 30, 2011 and 2010, we did not place in service any intangible assets with future renewals or extension costs. As of June 30, 2011 and 2010, the weighted average amortization period for all of our intangible assets was 19 years and 20 years, respectively. The weighted average amortization period for our rights-of-way and easements, contracts and customer relationships was 20 years, 18 years and 11 years, respectively, as of June 30, 2011. The weighted average amortization period for our rights-of-way and easements, contracts and customer relationships was 22 years, 18 years and 12 years, respectively, as of June 30, 2010. Amortization expense was $2,956,000 and $2,782,000 for the three months ended June 30, 2011 and 2010, respectively. Amortization expense was $5,854,000 and $5,562,000 for the six months ended June 30, 2011 and 2010, respectively.

Estimated aggregate amortization expense remaining for 2011 and each of the five succeeding fiscal years is approximately: 2011 — $5,920,000; 2012 — $11,916,000; 2013 — $11,742,000; 2014 — $11,464,000; 2015 — $11,403,000; and 2016 — $11,384,000.