Goodwill and Intangible Assets

The change in goodwill from December 31, 2016 to March 31, 2017 consisted of the following (in thousands):



	Carrying Value
Balance at December 31, 2016	$	437,935
Goodwill acquired	7,192
Purchase price allocation from prior periods	723
Impact of foreign exchange rates	191
Balance at March 31, 2017	$	446,041

As of March 31, 2017, goodwill allocated to the Specialty Building Products and Mechanical Insulation segments was $440.7 million and $5.3 million, respectively. As of December 31, 2016, goodwill allocated to the Specialty Building Products and Mechanical Insulation segments was $432.6 million and $5.3 million, respectively.

Identifiable intangible assets that are separable and have determinable useful lives are valued separately and amortized over their benefit period. The following is the gross carrying value and accumulated amortization of the Company’s identifiable intangible assets as of March 31, 2017 and December 31, 2016 (in thousands):



	March 31, 2017							December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Trade names	$	15,980	$	(4,887	)	$	11,093	$	15,980	$	(4,097	)	$	11,883
Customer relationships	239,056		(45,941		)	193,115		235,690		(35,550		)	200,140
Other intangible assets	3,850		(581		)	3,269		3,852		(494		)	3,358
	$	258,886	$	(51,409	)	$	207,477	$	255,522	$	(40,141	)	$	215,381