6. Intangible and Other Assets

Intangible and other assets consisted of the following (in thousands):

	December 31,
	2012		2011
Deferred debt issuance costs, net	$	18,348	$	24,581
Intangible assets, net	84,993		134,967
Deferred taxes	31,102		21,779
Other	40,405		41,524
Intangibles and other assets, net	$	174,848	$	222,851

Intangible assets and deferred debt issuance costs consisted of the following (in thousands):

	December 31, 2012					December 31, 2011
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Deferred debt issuance costs	$	44,112	$	(25,764	)	$	44,141	$	(19,560	)
Marketing related (5-20 year life)	3,060		(1,675		)	3,043		(1,400		)
Customer- related (10-20 year life)	164,562		(86,605		)	169,282		(73,566		)
Technology based (20 year life)	4,375		(3,561		)	32,275		(6,747		)
Contract based (2-11 year life)	55,776		(50,939		)	64,465		(52,385		)
Intangible assets and deferred debt issuance costs	$	271,885	$	(168,544	)	$	313,206	$	(153,658	)

Amortization of deferred financing costs totaled $7.2 million, $8.9 million and $5.3 million in 2012, 2011 and 2010, respectively, and is recorded to interest expense in our consolidated statements of operations. Amortization of intangible assets totaled $20.8 million, $24.0 million and $27.5 million in 2012, 2011 and 2010, respectively. During 2012, we recorded an impairment of intangible assets of $29.1 million related to our contract water treatment business (see Note 13).

Estimated future intangible amortization expense is as follows (in thousands):

2013	$	14,914
2014	12,381
2015	10,483
2016	8,987
2017	7,321
Thereafter	30,907
	$	84,993