5. Software and Other Intangible Assets

At December 31, 2011, software net book value totaled $22.6 million, net of $54.7 million of accumulated amortization. Included in this amount is software marketed for external sale of $10.3 million. The remaining software net book value of $12.3 million is comprised of various software that has been acquired or developed for internal use.

At December 31, 2010, software net book value totaled $25.4 million, net of $48.1 million of accumulated amortization. Included in this amount is software marketed for external sale of $13.5 million. The remaining software net book value of $11.9 million is comprised of various software that has been acquired or developed for internal use.

Amortization of acquired software marketed for external sale is computed using the greater of the ratio of current revenues to total current and anticipated revenues expected to be derived from the software or the straight-line method over an estimated useful life of generally three to six years. Software for resale amortization expense recorded during the years ended December 31, 2011, 2010 and 2009 totaled $6.3 million, $6.0 million, and $5.7 million, respectively. These software amortization expense amounts are reflected in cost of software license fees in the consolidated statements of income. Amortization of software for internal use recorded during the years ended December 31, 2011, 2010 and 2009 totaled $8.1 million, $7.4 million, and $5.5 million, respectively. These software amortization expense amounts are reflected in depreciation and amortization in the consolidated statements of income.

The carrying amount and accumulated amortization of the Company’s other intangible assets that were subject to amortization at each balance sheet date are as follows (in thousands):

		September 30,		September 30,			September 30,		September 30,		September 30,			September 30,
	December 31, 2011							December 31, 2010
	Gross							Gross
	Carrying		Accumulated			Net		Carrying		Accumulated			Net
	Amount		Amortization			Balance		Amount		Amortization			Balance
Customer relationships	$	40,298	$	(23,392	)	$	16,906	$	36,393	$	(18,855	)	$	17,538
Purchased contracts		10,750		(10,023	)		727		10,753		(8,504	)		2,249
Trademarks and tradenames		1,291		(585	)		706		1,062		(422	)		640
Covenant not to compete		80		(76	)		4		83		(62	)		21

	$	52,419	$	(34,076	)	$	18,343	$	48,291	$	(27,843	)	$	20,448

Other intangible assets amortization expense recorded during the years ended December 31, 2011, 2010 and 2009 totaled $6.4 million, $6.3 million, and $6.1 million, respectively. Based on capitalized intangible assets at December 31, 2011, and assuming no impairment of these intangible assets, estimated amortization expense amounts in future fiscal years are as follows (in thousands):

		September 30,		September 30,
			Other
			Intangible
	Software		Assets
Fiscal Year Ending December 31,	Amortization		Amortization
2012	$	12,252	$	5,367
2013		5,592		5,120
2014		3,338		3,366
2015		1,262		1,463
2016		154		1,196
Thereafter		—		1,831

Total	$	22,598	$	18,343