GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill since January 1, 2015, by reportable segment and for the "Other” category, were as follows:

In thousands
	Domestic Regulated Waste and Compliance Services			International Regulated Waste and Compliance Services			Other			Total
Balance as of January 1, 2015	$	1,467,969		$	614,783		$	336,080		$	2,418,832
Goodwill acquired during the year		1,150,437			273,519			26,994			1,450,950
Purchase accounting allocation adjustments for prior year acquisitions		(6,221	)		(19,072	)		(2,984	)		(28,277	)
Goodwill other changes		—			(440	)		—			(440	)
Changes due to foreign currency fluctuations		—			(82,888	)		—			(82,888	)
Balance as of December 31, 2015		2,612,185			785,902			360,090			3,758,177
Goodwill acquired during the year		33,041			4,422			2,873			40,336
Purchase accounting allocation adjustments for prior year acquisitions		(74,193	)		(103,398	)		(2,663	)		(180,254	)
Changes due to foreign currency fluctuations		—			(21,360	)		—			(21,360	)
Balance at September 30, 2016	$	2,571,033		$	665,566		$	360,300		$	3,596,899

Carrying Values of Other Intangible assets

At September 30, 2016 and December 31, 2015, the values of other intangible assets were as follows:

In thousands
	September 30, 2016						December 31, 2015
	Gross Carrying Amount		Accumulated Amortization		Net Value		Gross Carrying Amount		Accumulated Amortization		Net Value
Amortizable intangibles:
Customer relationships	$	1,579,988	$	241,368	$	1,338,620	$	1,304,388	$	144,020	$	1,160,368
Covenants not-to-compete		10,561		6,501		4,060		6,878		5,141		1,737
Tradenames		9,088		1,797		7,291		3,819		948		2,871
Other		19,005		2,924		16,081		18,902		916		17,986
Indefinite lived intangibles:
Operating permits		242,281		—		242,281		233,101		—		233,101
Tradenames		318,776		—		318,776		426,498		—		426,498
Total	$	2,179,699	$	252,590	$	1,927,109	$	1,993,586	$	151,025	$	1,842,561

Changes in the Carrying Amount of Intangible Assets

The changes in the carrying amount of intangible assets since January 1, 2015 were as follows:

In thousands
	Total
Balance as of January 1, 2015	$	909,645
Intangible assets acquired during the year		1,016,775
Valuation adjustments for prior year acquisitions		35,241
Impairments during the year		(4,177	)
Amortization during the year		(45,498	)
Changes due to foreign currency fluctuations		(69,425	)
Balance as of December 31, 2015		1,842,561
Intangible assets acquired during the year		23,235
Valuation adjustments for prior year acquisitions		178,621
Impairments during the year		(4	)
Amortization during the year		(102,311	)
Changes due to foreign currency fluctuations		(14,993	)
Balance at September 30, 2016	$	1,927,109

Estimated Amortization Expense

The estimated amortization expense for each of the next five years, assuming no additional amortizable intangible assets, is as follows for the years ended December 31:

In thousands
2016	$	132,122
2017		118,850
2018		118,788
2019		117,964
2020		116,353