Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

As of December 31, goodwill was as follows:



Goodwill	Integrated Networks - Group A			Integrated Networks -Group B			Media & Data Network			All Other			Total
Balance at December 31, 2017	$	139,452		$	252,645		$	190,481		$	252,301		$	834,879
Acquired goodwill	—			32,776			—			4,816			37,592
Impairment loss recognized	—			(17,828		)	(59,188		)	(4,691		)	(81,707		)
Transfer of goodwill between segments	—			211			(29,143		)	28,932			—
Transfer of goodwill to asset held for sale ⁽¹⁾	—			—			—			(45,224		)	(45,224		)
Foreign currency translation	—			(745		)	(382		)	(11,661		)	(12,788		)
Balance at December 31, 2018	$	139,452		$	267,059		$	101,768		$	224,473		$	732,752
Acquired goodwill	—			1,025			—			—			1,025
Impairment loss recognized	(4,879		)	—			—			—			(4,879		)
Transfer of goodwill between segments ⁽²⁾	—			(120		)	3,612			(3,492		)	—
Foreign currency translation	—			423			217			2,153			2,793
Balance at December 31, 2019	$	134,573		$	268,387		$	105,597		$	223,134		$	731,691

⁽¹⁾ See Note 4 of the Notes to the Consolidated Financial Statements included herein for additional information.

⁽²⁾ Transfers of goodwill relate to changes in segments.

As of December 31, the gross and net amounts of acquired intangible assets other than goodwill were as follows:



	Years Ended December 31,
Intangible Assets	2019			2018
Trademark (indefinite life)	$	14,600		$	14,600
Customer relationships – gross	$	58,211		$	76,365
Less accumulated amortization	(32,671		)	(42,180		)
Customer relationships – net	$	25,540		$	34,185
Other intangibles – gross	$	28,695		$	31,421
Less accumulated amortization	(13,942		)	(12,441		)
Other intangibles – net	$	14,753		$	18,980
Total intangible assets	$	101,506		$	122,386
Less accumulated amortization	(46,613		)	(54,621		)
Total intangible assets – net	$	54,893		$	67,765

The estimated amortization expense for the five succeeding years is as follows: