Other Intangible Assets

3 Months Ended

Mar. 31, 2013

Other Intangible Assets

Other Intangible Assets

Note 9. Other Intangible Assets

Our other intangible assets, which are subject to amortization, consisted of the following:

	Weighted	As of
	Average	March 31, 2013							December 31, 2012
	Useful life			Accumulated			Carrying				Accumulated			Carrying
	(in Years)	Cost		Amortization			Amount		Cost		Amortization			Amount
	(In thousands)
Customer relationships	8	$	293,932	$	(123,590	)	$	170,342	$	293,932	$	(113,906	)	$	180,026
Contract-based	10	255,366		(184,813		)	70,553		255,366		(178,138		)	77,228
Technology-based	7	126,272		(70,562		)	55,710		126,387		(66,338		)	60,049
Trademark portfolio	20	29,700		(2,723		)	26,977		29,700		(2,351		)	27,349
Favorable leases	4	4,707		(2,157		)	2,550		4,707		(1,863		)	2,844
Total other intangible assets		$	709,977	$	(383,845	)	$	326,132	$	710,092	$	(362,596	)	$	347,496

Customer relationships are amortized predominantly in relation to the estimated cash flows over the life of the intangible asset.  Other intangible assets are amortized on a straight-line basis over the periods the assets are expected to contribute to our cash flows.  For the three months ended March 31, 2013 and 2012, our total amortization expense was $22 million and $23 million, respectively.