GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 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		29,171			4,422			—			33,593
Purchase accounting allocation adjustments for prior year acquisitions		(128,076	)		(97,197	)		1,150			(224,123	)
Changes due to foreign currency fluctuations		—			(9,364	)		—			(9,364	)
Balance at June 30, 2016	$	2,513,280		$	683,763		$	361,240		$	3,558,283

Carrying Values of Other Intangible assets

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

In thousands
	June 30, 2016						December 31, 2015
	Gross Carrying Amount		Accumulated Amortization		Net Value		Gross Carrying Amount		Accumulated Amortization		Net Value
Amortizable intangibles:
Customer relationships	$	1,539,892	$	210,224	$	1,329,668	$	1,304,388	$	144,020	$	1,160,368
Covenants not-to-compete		9,875		6,137		3,738		6,878		5,141		1,737
Tradenames		7,513		1,540		5,973		3,819		948		2,871
Other		19,403		2,497		16,906		18,902		916		17,986
Indefinite lived intangibles:
Operating permits		241,208		—		241,208		233,101		—		233,101
Tradenames		480,741		—		480,741		426,498		—		426,498
Total	$	2,298,632	$	220,398	$	2,078,234	$	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		18,853
Valuation adjustments for prior year acquisitions		294,792
Amortization during the year		(69,183	)
Changes due to foreign currency fluctuations		(8,789	)
Balance at June 30, 2016	$	2,078,234

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	$	123,660
2017		114,502
2018		114,453
2019		113,680
2020		112,703