GOODWILL AND OTHER INTANGIBLE ASSETS

The Company has recorded goodwill as a result of its various business combinations. On April 5, 2017, the Company completed its acquisition of CEC. Refer to Note 3 - Business Combinations. Goodwill is recorded as the difference, if any, between the aggregate consideration paid for an acquisition and the fair value of the tangible assets and intangible assets acquired net of liabilities assumed, including noncontrolling interests. Changes in the Company's goodwill balances from December 31, 2017 to September 30, 2018 are as follows (in thousands):



	December 31, 2017		Acquisition Adjustments			Foreign Currency Translation			September 30, 2018
U.S. Corrections & Detention	$	317,005	$	(639	)	$	—		$	316,366
GEO Care	461,499		(1,910		)	—			459,589
International Services	447		—			(34		)	413
Total Goodwill	$	778,951	$	(2,549	)	$	(34	)	$	776,368

The Company has also recorded other finite and indefinite-lived intangible assets as a result of its various business combinations. Refer to Note 3 - Business Combinations for a discussion of the Company's recent acquisition of CEC. The Company's intangible assets include facility management contracts, covenants not to compete, trade names and technology, as follows (in thousands):



		September 30, 2018							December 31, 2017
	Weighted Average Useful Life (years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Facility management contracts	16.3	$	308,431	$	(122,309	)	$	186,122	$	308,518	$	(106,724	)	$	201,794
Covenants not to compete	1	700		(700		)	—		700		(517		)	183
Technology	7.3	33,700		(27,075		)	6,625		33,700		(25,538		)	8,162
Trade name (Indefinite lived)	Indefinite	45,200		—			45,200		45,200		—			45,200
Total acquired intangible assets		$	388,031	$	(150,084	)	$	237,947	$	388,118	$	(132,779	)	$	255,339

Amortization expense was $17.3 million and $18.1 million for the nine months ended September 30, 2018 and 2017, respectively. Amortization expense was primarily related to the U.S. Corrections & Detention and GEO Care segments' amortization of acquired facility management contracts. As of September 30, 2018, the weighted average period before the next contract renewal or extension for the acquired facility management contracts was approximately 1.5 years. Although the facility management contracts acquired have renewal and extension terms in the near term, the Company has historically maintained these relationships beyond the current contractual periods.

Estimated amortization expense related to the Company's finite-lived intangible assets for the remainder of 2018 through 2022 and thereafter is as follows (in thousands):



Fiscal Year	Total Amortization Expense
Remainder of 2018	$	5,647
2019	22,305
2020	22,305
2021	19,782
2022	18,103
Thereafter	104,605
	$	192,747