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Condensed Consolidated Unaudited Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Peirce-Phelps, Inc.	Dunphey & Associates Supply Co., Inc.	Common Stock Peirce-Phelps, Inc.	Common Stock Dunphey & Associates Supply Co., Inc.	Common Stock, Class B Common Stock and Preferred Stock	Paid-In Capital	Paid-In Capital Peirce-Phelps, Inc.	Paid-In Capital Dunphey & Associates Supply Co., Inc.	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock	Non-controlling Interest
Beginning balance at Dec. 31, 2017	$ 1,550,977					$ 21,050	$ 804,008			$ (34,221)	$ 594,556	$ (87,440)	$ 253,024
Beginning balance (in shares) at Dec. 31, 2017						37,228,715
Cumulative-effect adjustment at Dec. 31, 2017										301	(301)
Net income	42,377										34,219		8,158
Other comprehensive income (loss)	(5,741)									(3,649)			(2,092)
Issuances of non-vested restricted shares of common stock						$ 46	(46)
Issuances of non-vested restricted shares of common stock (in shares)						91,609
Forfeitures of non-vested restricted shares of common stock						$ (2)	2
Forfeitures of non-vested restricted shares of common stock (in shares)						(3,000)
Common stock contribution to 401(k) plan	2,945					$ 9	2,936
Common stock contribution to 401(k) plan (in shares)						17,318
Stock issuances from exercise of stock options and employee stock purchase plan	4,341					$ 19	4,322
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)						37,130
Retirement of common stock	(914)					$ (3)	(911)
Retirement of common stock (in shares)						(5,041)
Share-based compensation	4,400						4,400
Cash dividends declared and paid on Common and Class B common stock	(46,581)										(46,581)
Distributions to non-controlling interest	(2,178)												(2,178)
Ending balance at Mar. 31, 2018	1,549,626					$ 21,119	814,711			(37,569)	581,893	(87,440)	256,912
Ending balance (in shares) at Mar. 31, 2018						37,366,731
Beginning balance at Dec. 31, 2017	1,550,977					$ 21,050	804,008			(34,221)	594,556	(87,440)	253,024
Beginning balance (in shares) at Dec. 31, 2017						37,228,715
Cumulative-effect adjustment at Dec. 31, 2017										301	(301)
Net income	247,527
Other comprehensive income (loss)	(6,717)
Ending balance at Sep. 30, 2018	1,660,550					$ 21,148	829,050			(38,157)	642,643	(87,440)	293,306
Ending balance (in shares) at Sep. 30, 2018						37,424,364
Beginning balance at Mar. 31, 2018	1,549,626					$ 21,119	814,711			(37,569)	581,893	(87,440)	256,912
Beginning balance (in shares) at Mar. 31, 2018						37,366,731
Net income	108,264										89,957		18,307
Other comprehensive income (loss)	(4,561)									(2,890)			(1,671)
Issuances of non-vested restricted shares of common stock						$ 4	(4)
Issuances of non-vested restricted shares of common stock (in shares)						8,500
Forfeitures of non-vested restricted shares of common stock						$ (2)	2
Forfeitures of non-vested restricted shares of common stock (in shares)						(5,000)
Stock issuances from exercise of stock options and employee stock purchase plan	1,601					$ 6	1,595
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)						11,935
Retirement of common stock	(2,499)					$ (7)	(2,492)
Retirement of common stock (in shares)						(14,534)
Share-based compensation	3,747						3,747
Cash dividends declared and paid on Common and Class B common stock	(54,184)										(54,184)
Ending balance at Jun. 30, 2018	1,601,994					$ 21,120	817,559			(40,459)	617,666	(87,440)	273,548
Ending balance (in shares) at Jun. 30, 2018						37,367,632
Net income	96,886										79,163		17,723
Other comprehensive income (loss)	3,585									2,302			1,283
Issuances of non-vested restricted shares of common stock						$ 5	(5)
Issuances of non-vested restricted shares of common stock (in shares)						10,000
Forfeitures of non-vested restricted shares of common stock						$ (1)	1
Forfeitures of non-vested restricted shares of common stock (in shares)						(2,000)
Stock issuances from exercise of stock options and employee stock purchase plan	1,299					$ 5	1,294
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)						10,835
Retirement of common stock	(1,631)					$ (5)	(1,626)
Retirement of common stock (in shares)						(9,206)
Share-based compensation	3,671						3,671
Cash dividends declared and paid on Common and Class B common stock	(54,186)										(54,186)
Common stock issued	8,180					$ 24	8,156
Common stock issued (in shares)						47,103
Investment in unconsolidated entity	752												752
Ending balance at Sep. 30, 2018	1,660,550					$ 21,148	829,050			(38,157)	642,643	(87,440)	293,306
Ending balance (in shares) at Sep. 30, 2018						37,424,364
Beginning balance at Dec. 31, 2018	1,601,713					$ 21,167	832,121			(45,968)	627,969	(87,440)	253,864
Beginning balance (in shares) at Dec. 31, 2018						37,461,643
Net income	43,804										35,037		8,767
Other comprehensive income (loss)	4,195									2,783			1,412
Issuances of non-vested restricted shares of common stock						$ 39	(39)
Issuances of non-vested restricted shares of common stock (in shares)						77,049
Forfeitures of non-vested restricted shares of common stock						$ (3)	3
Forfeitures of non-vested restricted shares of common stock (in shares)						(5,000)
Common stock contribution to 401(k) plan	4,274					$ 15	4,259
Common stock contribution to 401(k) plan (in shares)						30,715
Stock issuances from exercise of stock options and employee stock purchase plan	1,125					$ 4	1,121
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)						8,925
Retirement of common stock	(428)					$ (1)	(427)
Retirement of common stock (in shares)						(2,985)
Share-based compensation	4,537						4,537
Cash dividends declared and paid on Common and Class B common stock	(59,965)										(59,965)
Ending balance at Mar. 31, 2019	1,599,255					$ 21,221	841,575			(43,185)	603,041	(87,440)	264,043
Ending balance (in shares) at Mar. 31, 2019						37,570,347
Beginning balance at Dec. 31, 2018	1,601,713					$ 21,167	832,121			(45,968)	627,969	(87,440)	253,864
Beginning balance (in shares) at Dec. 31, 2018						37,461,643
Net income	251,369
Other comprehensive income (loss)	5,924
Ending balance at Sep. 30, 2019	1,753,022					$ 21,485	894,917			(42,040)	656,187	(87,440)	309,913
Ending balance (in shares) at Sep. 30, 2019						38,097,236
Beginning balance at Mar. 31, 2019	1,599,255					$ 21,221	841,575			(43,185)	603,041	(87,440)	264,043
Beginning balance (in shares) at Mar. 31, 2019						37,570,347
Net income	107,910										90,155		17,755
Other comprehensive income (loss)	4,652									3,039			1,613
Issuances of non-vested restricted shares of common stock						$ 13	(13)
Issuances of non-vested restricted shares of common stock (in shares)						26,354
Stock issuances from exercise of stock options and employee stock purchase plan	1,951					$ 9	1,942
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)						15,807
Retirement of common stock	(555)					$ (2)	(553)
Retirement of common stock (in shares)						(3,608)
Share-based compensation	4,324						4,324
Cash dividends declared and paid on Common and Class B common stock	(60,213)										(60,213)
Common stock issued			$ 7,450		$ 25				$ 7,425
Common stock issued (in shares)					50,952
Investment in unconsolidated entity	988												988
Decrease in non-controlling interest in Carrier Enterprise II	(32,400)						(25,768)						(6,632)
Ending balance at Jun. 30, 2019	1,633,362					$ 21,266	828,932			(40,146)	632,983	(87,440)	277,767
Ending balance (in shares) at Jun. 30, 2019						37,659,852
Net income	99,655										83,480		16,175
Other comprehensive income (loss)	(2,923)									(1,894)			(1,029)
Issuances of non-vested restricted shares of common stock						$ 19	(19)
Issuances of non-vested restricted shares of common stock (in shares)						37,834
Forfeitures of non-vested restricted shares of common stock						$ (3)	3
Forfeitures of non-vested restricted shares of common stock (in shares)						(5,337)
Stock issuances from exercise of stock options and employee stock purchase plan	4,529					$ 19	4,510
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)						36,374
Retirement of common stock	(669)					$ (2)	(667)
Retirement of common stock (in shares)						(4,030)
Share-based compensation	3,706						3,706
Cash dividends declared and paid on Common and Class B common stock	(60,276)										(60,276)
Common stock issued		$ 58,638		$ 186				$ 58,452
Common stock issued (in shares)				372,543
Investment in Peirce-Phelps, Inc.	17,000												17,000
Ending balance at Sep. 30, 2019	$ 1,753,022					$ 21,485	$ 894,917			$ (42,040)	$ 656,187	$ (87,440)	$ 309,913
Ending balance (in shares) at Sep. 30, 2019						38,097,236

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