. GOODWILL AND INTANGIBLE ASSETS

Goodwill:

Goodwill by reporting unit as at March 31, 2019 and December 31, 2018 was as follows:



	Bulgaria			Czech Republic			Romania			Slovak Republic			Slovenia			Total
Gross Balance, December 31, 2018	$	173,694		$	808,970		$	86,800		$	50,081		$	19,400		$	1,138,945
Accumulated impairment losses	(144,639		)	(287,545		)	(11,028		)	—			(19,400		)	(462,612		)
Balance, December 31, 2018	29,055			521,425			75,772			50,081			—			676,333
Foreign currency	(545		)	(11,399		)	(2,986		)	(942		)	—			(15,872		)
Balance, March 31, 2019	28,510			510,026			72,786			49,139			—			660,461
Accumulated impairment losses	(144,639		)	(287,545		)	(11,028		)	—			(19,400		)	(462,612		)
Gross Balance, March 31, 2019	$	173,149		$	797,571		$	83,814		$	49,139		$	19,400		$	1,123,073

Other intangible assets:

Changes in the net book value of our other intangible assets as at March 31, 2019 and December 31, 2018 are summarized as follows:



	March 31, 2019							December 31, 2018
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
Indefinite-lived:
Trademarks	$	85,263	$	—		$	85,263	$	87,356	$	—		$	87,356
Amortized:
Broadcast licenses	205,934		(161,371		)	44,563		210,447		(162,936		)	47,511
Trademarks	610		(610		)	—		631		(631		)	—
Customer relationships	54,668		(54,032		)	636		56,024		(55,158		)	866
Other	2,867		(1,558		)	1,309		1,868		(1,549		)	319
Total	$	349,342	$	(217,571	)	$	131,771	$	356,326	$	(220,274	)	$	136,052

Net broadcast licenses consist solely of our TV NOVA license in the Czech Republic, which is amortized on a straight-line basis through the expiration date of the license in 2025. Our customer relationships are deemed to have an economic useful life of, and are amortized on a straight-line basis, over five years to fifteen years.