11)

Intangible Assets, Net

The change in the carrying amount of intangible assets, net, for the years ended December 31, 2016 and 2015 are as follows:


	Precision Bearing Components Group			Autocam Precision Components Group			Precision Engineered Products Group			Total
Balance as of December 31, 2014	$	2,328		$	50,499		$	—		$	52,827
Additions		—			—			242,980			242,980
Amortization		(238	)		(3,625	)		(9,180	)		(13,043	)
Currency impacts		(138	)		(457	)		—			(595	)

Balance as of December 31, 2015	$	1,952		$	46,417		$	233,800		$	282,169
Amortization		(207	)		(3,533	)		(22,465	)		(26,205	)
Currency impacts		(27	)		44			—			17

Balance as of December 31, 2016	$	1,718		$	42,928		$	211,335		$	255,981

With the PEP Acquisition, the Precision Engineered Products Group acquired a customer relationship intangible asset of $226.5 million, a trade name intangible asset of $6.3 million, a backlog and unfavorable leasehold intangible of $7.7 million. The intangible assets have estimated useful lives of 12 years for customer relationships and 8 years for trade name, and the backlog and unfavorable leases will be amortized over the fourth quarter of 2015 and first quarter of 2016. After the estimated useful lives of the backlog and inventory, the estimated amortization of intangibles will be approximately $19.7 million a year.

With the Caprock acquisition, the Precision Engineered Products Group acquired $2.5 million of intangibles, approximately $0.1 in trade names and $2.4 million in customer relationships. The intangibles have estimated useful lives of one year for trade names and 12 years for customer relationships. The estimated amortization of the intangibles will be approximately $0.2 million per year.

The Autocam Precision Components Group has an intangible asset not subject to amortization of $0.9 million related to the value of the trade names of Whirlaway. This indefinite lived intangible asset was impaired during the year ended December 31, 2014 as management is in the process of phasing out the use of the trade name as a result of the Autocam acquisition. As such, an impairment charge of $0.9 million was included in the restructuring and impairment charges line of the Consolidated Statements of Operations and Comprehensive Income (Loss).

With the Autocam acquisition, the Autocam Precision Components Group acquired a customer contract intangible asset of $46.2 million, a trade name intangible asset of $4.1 million, a developed technology intangible asset of $0.9 million, and net favorable leasehold intangible of $0.4 million. The trade names and customer relationship intangible assets have estimated useful lives of 15 years, and the remaining intangibles have a five year useful life. The estimated amortization for the first five year will be approximately $3.5 million per year.

The Precision Bearing Components Group acquired two customer contract intangible assets related to the acquisition of RKF and Chelsea and a trade name intangible asset related to the acquisition of RFK with an aggregate estimated fair value of $2.7 million. These intangible assets have weighted average useful lives of 10 years and are subject to amortization of approximately $0.3 million per year.