Goodwill and Intangible Assets

The change in goodwill from December 31, 2017, to June 30, 2018, consisted of the following (in thousands):



	Carrying Value
Balance at December 31, 2017	$	458,737
Goodwill acquired	8,404
Purchase price allocation adjustments	(93		)
Impact of foreign exchange rates	(1,286		)
Balance at June 30, 2018	$	465,762

As of June 30, 2018, goodwill allocated to the SBP and MI segments was $459.9 million and $5.9 million, respectively. As of December 31, 2017, goodwill allocated to the SBP and MI segments was $452.8 million and $5.9 million, respectively. Changes to initial purchase price allocations related to acquisitions may arise from changes in estimates from conditions that existed at the applicable acquisition date and as a result of net working capital adjustments.

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 June 30, 2018, and December 31, 2017 (in thousands):



	June 30, 2018							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Trade names	$	15,980	$	(8,853	)	$	7,127	$	15,980	$	(7,283	)	$	8,697
Customer relationships	260,349		(100,463		)	159,886		256,650		(78,406		)	178,244
Other intangible assets	3,656		(931		)	2,725		3,640		(811		)	2,829
	$	279,985	$	(110,247	)	$	169,738	$	276,270	$	(86,500	)	$	189,770

The weighted average amortization period of these intangible assets in the aggregate is 3.9 years.