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Pro Forma Effect of Businesses Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition
Revenue, as reported		$ 2,465,800	$ 2,207,343	$ 7,267,054	$ 6,433,625
Pro forma revenue		2,484,464	2,384,553	7,462,604	7,321,617
Income from continuing operations		122,381	109,844	414,104	359,825
Pro forma income from continuing operations		$ 125,299	$ 112,958	$ 425,386	$ 386,996
Basic earnings per share from continuing operations		$ 0.40	$ 0.36	$ 1.34	$ 1.17
Pro forma earnings per share from continuing operations, basic (4)	[1]	0.41	0.37	1.38	1.26
Diluted earnings per share from continuing operations		0.39	0.35	1.33	1.16
Pro forma earnings per share from continuing operations, diluted (4)	[1]	$ 0.40	$ 0.36	$ 1.37	$ 1.25
Rhiag
Business Acquisition
Revenue of purchased businesses for the period prior to acquisition		$ 0	$ 0	$ 0	$ 213,376
Income (loss) from continuing operations of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments		$ 0	$ 59	$ 0	$ (84)
Effect of purchased businesses for the period prior to acquisition		$ 0.00	$ 0.00	$ 0.00	$ 0.00
Business Acquisition Pro Forma Income Loss From Continuing Operations Per Diluted Share Effect Of Purchased Business		$ 0.00	$ 0.00	$ 0.00	$ 0.00
PGW
Business Acquisition
Revenue of purchased businesses for the period prior to acquisition		$ 0	$ 0	$ 0	$ 102,540
Income (loss) from continuing operations of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments		$ 0	$ 0	$ 0	$ 7,574
Effect of purchased businesses for the period prior to acquisition		$ 0.00	$ 0.00	$ 0.00	$ 0.02
Business Acquisition Pro Forma Income Loss From Continuing Operations Per Diluted Share Effect Of Purchased Business		$ 0.00	$ 0.00	$ 0.00	$ 0.02
Pro Forma costs excluded					$ 5,000
All 2017 Acquisitions
Business Acquisition
Revenue of purchased businesses for the period prior to acquisition		$ 18,664		$ 195,550
Income (loss) from continuing operations of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments		734		6,481
Acquisition related costs, net of tax		$ 2,184		$ 4,801
Effect of purchased businesses for the period prior to acquisition		$ 0.00		$ 0.02
Acquisition related expenses, net of tax		0.01		0.02
Business Acquisition Pro Forma Income Loss From Continuing Operations Per Diluted Share Effect Of Purchased Business		0.00		0.02
Acquisition related expenses, net of tax		$ 0.01		$ 0.02
All 2017 and 2016 Acquisitions Excluding Rhiag and PGW
Business Acquisition
Revenue of purchased businesses for the period prior to acquisition			$ 177,210		572,076
Income (loss) from continuing operations of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments			$ 2,727		$ 9,198
Effect of purchased businesses for the period prior to acquisition			$ 0.01		$ 0.03
Business Acquisition Pro Forma Income Loss From Continuing Operations Per Diluted Share Effect Of Purchased Business			$ 0.01		$ 0.03
All 2016 Acquisitions
Business Acquisition
Acquisition related costs, net of tax			$ 328		$ 10,483
Acquisition related expenses, net of tax			$ 0.00
Acquisition related expenses, net of tax			$ 0.00		$ 0.03
[1] PGW reflects the results for the continuing aftermarket automotive glass distribution business only.

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