Intangible Assets

6 Months Ended

Mar. 31, 2016

6.Intangible Assets

The following table summarizes the gross carrying amounts and related accumulated amortization of intangible assets as of:


					September 30, 2015				March 31, 2016
					Gross				Gross
	Estimated				Carrying		Accumulated		Carrying		Accumulated
(in thousands of dollars)	useful lives				Amount		Amortization		Amount		Amortization
Trade names	Indefinite				$	15,300	$	—	$	22,135	$	—
Intellectual property	Indefinite					—		—		10,650		—
CCP contracts	15	-	20	years		112,300		69,875		112,300		72,717
Customer relationships	5	-	17	years		109,078		57,844		117,849		61,955
Trade names	5	-	20	years		66,960		36,554		66,960		38,245
Patents and patented technologies	5	-	19	years		14,526		12,574		15,021		12,515
Other	5	-	17	years		4,585		2,184		4,685		2,406
					$	322,749	$	179,031	$	349,600	$	187,838

The above table includes preliminary amounts for only a portion of the intangible assets acquired in 2016 because the process of identifying and valuing those assets is in the early stages. Total amortization expense related to intangible assets was approximately $4.6 million and $4.8 million for the March 2015 and 2016 quarters, respectively, and approximately $9.0 million and $9.4 million for the six months ended March 31, 2015 and 2016, respectively.

Total estimated annual amortization expense for 2016 through 2021 is shown in the following table; however, the amounts will change once the intangible assets for the recent acquisitions are identified and valuations are finalized.


Year ending September 30, :	(in thousands)
2016	$	18,759
2017		17,875
2018		17,830
2019		16,808
2020		12,574
2021		12,514