Other intangible assets which are included in Other long-term assets in the accompanying Consolidated Balance Sheets consisted of the following (in thousands):

			December 31, 2013		Amortization and Impairment		Acquisitions		Effect of Foreign Currency		December 31, 2014
Customer relationships, gross		$	50,830	$	-		14,115		(1,031)	$	63,914
Customer relationships -
	accumulated amortization		(13,547)		(6,779)		-		-		(20,326)
Other intangible assets, gross			11,634		-		1,607		(128)		13,113
Other intangible assets -
	accumulated amortization		(3,818)		(2,691)		-		-		(6,509)
Trade name - indefinite life			9,713		-		-		-		9,713
	Other intangible assets, net	$	54,812	$	(9,470)	$	15,722	$	(1,159)	$	59,905

			December 31, 2012		Amortization and Impairment		Acquisitions		Effect of Foreign Currency		December 31, 2013
Customer relationships, gross		$	46,171	$	-	$	5,920	$	(1,261)	$	50,830
Customer relationships -
	accumulated amortization		(8,588)		(5,343)		-		384		(13,547)
Other intangible assets, gross			8,021		-		3,600		13		11,634
Other intangible assets -
	accumulated amortization		(1,943)		(1,875)		-		-		(3,818)
Trade name - indefinite life			10,800		(1,087)		-		-		9,713
	Other intangible assets, net	$	54,461	$	(8,305)	$	9,520	$	(864)	$	54,812

Customer relationships are being amortized over the remaining weighted average useful life of 8.4 years and other intangible assets are being amortized over the remaining weighted average useful life of 3.7 years. Amortization expense related to intangible assets was $9.6 million, $7.2 million and $3.7 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Expected future amortization of other intangible assets as of December 31, 2014 is as follows (in thousands):

In connection with the reorganization of the CSS segment an interim impairment analysis was completed during the second quarter of 2013. The indefinite-lived intangible asset evaluated for impairment consisted of the PRG trade name. The Company calculated the fair value of the trade name using a relief from royalty method based on forecasted revenues sold under the trade name using significant inputs not observable in the market (Level 3 inputs). The valuation assumptions included an estimated royalty rate of 6.0%, a discount rate specific to the trade name of 38.0% and a perpetuity growth rate of 7.0%. Based on the calculated fair value of $5.3 million, the Company recorded impairment expense of $1.1 million in the three months ended June 30, 2013. The Company reevaluated the PRG trade name for impairment as of December 31, 2013. The Company used the same method to fair value the PRG trade name and similar inputs described above. The forecasted revenues used to fair value the PRG trade name changed resulting in a fair value of $5.7 million. This fair value was approximately 7% higher than the book value of $5.3 million. As a result, the Company continues to evaluate the PRG trade name for impairment.

Definite-lived long-lived assets consisted of fixed assets and an intangible asset related to the PRG customer relationships. The Company determined that the undiscounted future cash flows would be sufficient to cover the net book value of all definite-lived long-lived assets upon reorganization of the Customer Strategy Services segment and as of December 31, 2013.