Goodwill

The following table shows changes in the carrying amount of goodwill.



	Mobile Solutions			Power Solutions		Life Sciences			Total
Balance as of December 31, 2017	$	74,147		$	201,881	$	178,584		$	454,612
Currency impacts	(705		)	27		(3,037		)	(3,715		)
Goodwill acquired in acquisitions	—			2,657		165,454			168,111
Measurement period adjustments	—			—		5,447			5,447
Balance as of September 30, 2018	$	73,442		$	204,565	$	346,448		$	624,455

The goodwill acquired in 2018 is related to the Paragon Medical, Bridgemedica, and Technical Arts acquisitions as described in Note 3 and is derived from the value of the businesses acquired. We recorded $162.4 million of goodwill related to the Paragon Medical acquisition, $8.0 million related to the Bridgemedica acquisition, and $2.7 million related to the Technical Arts acquisition during the nine months ended September 30, 2018. We have completed a preliminary purchase price allocation and are in the process of finalizing the fair value of assets acquired and liabilities assumed. The preliminary fair value of the businesses acquired was based on management business plans and future performance estimates which are subject to a high degree of management judgment and complexity. Actual results may differ from these projections and the differences may be material.

In the first quarter of 2018, as a result of the changes in our organizational and management structure, goodwill was reassigned to operating segments using a relative fair value allocation. For further information on the organizational changes, see Note 1.

Based on the closing sales price of a share of our common stock as of September 30, 2018, our market capitalization exceeded the $641.0 million net book value of our stockholders’ equity. Subsequent to September 30, 2018, our market capitalization declined to a level that is less than the net book value of our stockholders’ equity. A prolonged or significant decline in market capitalization could be an indicator of possible goodwill impairment. We will perform our annual goodwill impairment test during the fourth quarter to determine whether any impairment charge is required. We will continue to monitor the market capitalization relative to net book value throughout the fourth quarter and subsequent periods.