GOODWILL AND INTANGIBLE ASSETS, NET

Goodwill by reportable segment was as follows:



	North America			Europe			Total
Balance as of January 1, 2017	$	76,812		$	32,477		$	109,289
Other acquisitions	199			4,533			4,732
Other acquisitions purchase accounting adjustments	(285		)	2,100			1,815
Effect of currency translation	564			3,131			3,695
Balance as of December 31, 2017	77,290			42,241			119,531
Continuum acquisition (Note 2)	26,617			—			26,617
Think acquisition (Note 2)	—			22,482			22,482
Effect of currency translation	(365		)	(1,433		)	(1,798		)
Balance as of December 31, 2018	$	103,542		$	63,290		$	166,832

Excluded from the table above is the Russia segment for which the allocated goodwill was fully impaired for the periods presented. The Russia segment had accumulated goodwill impairment losses of $2,241 as of December 31, 2018, 2017 and 2016. There were no accumulated goodwill impairment losses in the North America or Europe reportable segments as of December 31, 2018, 2017 or 2016.

Intangible assets other than goodwill as of December 31, 2018 and 2017 were as follows:



	As of December 31, 2018
	Weighted average life at acquisition (in years)	Gross carrying amount		Accumulated amortization			Net carrying amount
Customer relationships	9.5	$	78,042	$	(29,580	)	$	48,462
Favorable lease	11.2	5,500		(410		)	5,090
Trade names	5.3	6,111		(4,300		)	1,811
Contract royalties	8	1,900		(198		)	1,702
Total		$	91,553	$	(34,488	)	$	57,065



	As of December 31, 2017
	Weighted average life at acquisition (in years)	Gross carrying amount		Accumulated amortization			Net carrying amount
Customer relationships	10	$	66,646	$	(22,200	)	$	44,446
Trade names	5	4,099		(4,034		)	65
Total		$	70,745	$	(26,234	)	$	44,511

All of the intangible assets other than goodwill have finite lives and as such are subject to amortization. Amortization of the favorable lease asset is recognized as rent expense and included in selling, general and administrative expenses and amortization of the other intangible assets is recognized in depreciation and amortization expense in the consolidated statements of income and comprehensive income.

The following table presents amortization expense recognized for the periods indicated:



	For the Years Ended December 31,
	2018		2017		2016
Customer relationships	$	7,637	$	6,643	$	6,858
Favorable lease	410		—		—
Trade names	266		896		1,139
Contract royalties	198		—		—
Non-competition agreements	—		23		173
Total	$	8,511	$	7,562	$	8,170

The following table presents estimated amortization expense related to the Company’s existing intangible assets for the years ended December 31:



	Amount
2019	$	9,520
2020	9,520
2021	9,520
2022	9,379
2023	8,153
Thereafter	10,973
Total	$	57,065