Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Acquired Finite-Lived Intangible Assets [Line Items]

Schedule Of Inventory

Inventories consist of the following (in thousands):

	December 31,
	2017		2016
Aftermarket and refurbished products	$	1,877,653	$	1,540,257
Salvage and remanufactured products	487,108		394,980
Manufactured products	16,022		—
Total inventories	$	2,380,783	$	1,935,237

Schedule Of Estimated Useful Lives

Our estimated useful lives are as follows:

Land improvements	10-20 years
Buildings and improvements	20-40 years
Machinery and equipment	3-20 years
Computer equipment and software	3-10 years
Vehicles and trailers	3-10 years
Furniture and fixtures	5-7 years

Schedule Of Property And Equipment

Property, plant and equipment consists of the following (in thousands):

	December 31,
	2017			2016
Land and improvements	$	137,790		$	127,211
Buildings and improvements	233,078			209,773
Machinery and equipment	521,526			429,446
Computer equipment and software	133,753			120,316
Vehicles and trailers	161,269			138,263
Furniture and fixtures	31,794			28,405
Leasehold improvements	257,506			152,356
	1,476,716			1,205,770
Less—Accumulated depreciation	(606,112		)	(495,644		)
Construction in progress	42,485			101,450
Total property, plant and equipment, net	$	913,089		$	811,576

Changes In Carrying Amount Of Goodwill

The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands):

	North America (1)			Europe			Specialty (1)			Total
Balance as of January 1, 2015	$	1,379,681		$	616,819		$	292,395		$	2,288,895
Business acquisitions and adjustments to previously recorded goodwill	72,355			21,217			(1,397		)	92,175
Exchange rate effects	(18,537		)	(43,554		)	267			(61,824		)
Balance as of December 31, 2015	$	1,433,499		$	594,482		$	291,265		$	2,319,246
Business acquisitions and adjustments to previously recorded goodwill	226,483			614,437			1,889			842,809
Exchange rate effects	1,818			(108,943		)	(161		)	(107,286		)
Balance as of December 31, 2016	$	1,661,800		$	1,099,976		$	292,993		$	3,054,769
Business acquisitions and adjustments to previously recorded goodwill	39,836			155,366			119,615			314,817
Exchange rate effects	7,718			159,556			(349		)	166,925
Balance as of December 31, 2017	$	1,709,354		$	1,414,898		$	412,259		$	3,536,511

Schedule of Finite-Lived and Indefinite-Lived Intangibles [Table Text Block]

The components of other intangibles, net are as follows (in thousands):

	December 31, 2017		December 31, 2016
Intangible assets subject to amortization	$	664,969	$	584,231
Indefinite-lived intangible assets (1)	78,800		—
Total	$	743,769	$	584,231

Schedule of Estimated Useful Lives, Finite Lived Intangible Assets [Table Text Block]

Our estimated useful lives for our finite-lived intangible assets are as follows:

	Method of Amortization	Useful Life
Trade names and trademarks	Straight-line	4-30 years
Customer and supplier relationships	Accelerated	6-20 years
Software and other technology related assets	Straight-line	3-15 years
Covenants not to compete	Straight-line	2-5 years

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

The components of other intangibles acquired during the years ended December 31, 2017 and 2016 include the following (in thousands):

	Year Ended		Year Ended
	December 31, 2017		December 31, 2016
	All Acquisitions		Rhiag		PGW		Other Acquisitions		Total
Trade names and trademarks (1)	$	87,306	$	127,351	$	5,500	$	1,015	$	133,866
Customer and supplier relationships	75,450		291,893		29,700		—		321,593
Software and other technology related assets	15,757		10,116		1,154		1,420		12,690
Covenants not to compete	2,703		—		1,600		102		1,702
Total	$	181,216	$	429,360	$	37,954	$	2,537	$	469,851

Components Of Other Intangibles

The components of intangible assets subject to amortization are as follows (in thousands):

	December 31, 2017							December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Trade names and trademarks	$	327,332	$	(75,095	)	$	252,237	$	286,008	$	(51,104	)	$	234,904
Customer and supplier relationships	510,113		(167,532		)	342,581		395,284		(92,079		)	303,205
Software and other technology related assets	124,049		(59,081		)	64,968		77,329		(35,648		)	41,681
Covenants not to compete	14,981		(9,798		)	5,183		11,726		(7,285		)	4,441
Total	$	976,475	$	(311,506	)	$	664,969	$	770,347	$	(186,116	)	$	584,231

Schedule of Weighted-Average Amortization Period of Intangible Assets [Table Text Block]

The weighted-average amortization periods for our intangible assets acquired during the years ended December 31, 2017 and 2016 are as follows (in years):

	Year Ended	Year Ended
	December 31, 2017	December 31, 2016
	All Acquisitions	Rhiag	PGW	Other Acquisitions	Total
Trade names and trademarks	11.2	20.0	20.0	20.0	20.0
Customer and supplier relationships	18.6	15.0	10.0	—	14.5
Software and other technology related assets	11.1	5.0	14.6	5.4	5.7
Covenants not to compete	4.4	—	5.0	2.0	4.8
Total intangible assets	16.5	16.2	11.4	11.1	15.8

Changes In Warranty Reserve

The changes in the warranty reserve are as follows (in thousands):

Balance as of January 1, 2016	$	17,363
Warranty expense	32,096
Warranty claims	(29,825		)
Balance as of December 31, 2016	$	19,634
Warranty expense	38,608
Warranty claims	(35,091		)
Balance as of December 31, 2017	$	23,151