The following is a summary of certain financial data for each of our segments (in thousands):



	Animal Hospital			Laboratory		All Other			Corporate			Eliminations			Total
Three Months Ended September 30, 2014
External revenue	$	395,820		$	77,394	$	25,397		$	—		$	966		$	499,577
Intercompany revenue	—			14,509		4,684			—			(19,193		)	—
Total revenue	395,820			91,903		30,081			—			(18,227		)	499,577
Direct costs	327,283			46,879		19,945			—			(18,287		)	375,820
Gross profit	68,537			45,024		10,136			—			60			123,757
Selling, general and administrative expense	9,269			8,610		8,023			16,890			—			42,792
Operating income (loss) before charges	59,268			36,414		2,113			(16,890		)	60			80,965
Impairment of goodwill and other long-lived assets	—			—		27,019			—			—			27,019
Net loss (gain) on sale or disposal of assets	598			7		—			(135		)	—			470
Operating income (loss)	$	58,670		$	36,407	$	(24,906	)	$	(16,755	)	$	60		$	53,476
Depreciation and amortization	$	15,201		$	2,671	$	1,781		$	688		$	(479	)	$	19,862
Capital expenditures	$	17,224		$	2,391	$	1,123		$	2,025		$	(649	)	$	22,114
Three Months Ended September 30, 2013
External revenue	$	368,868		$	72,877	$	21,482		$	—		$	828		$	464,055
Intercompany revenue	—			13,583		5,980			—			(19,563		)	—
Total revenue	368,868			86,460		27,462			—			(18,735		)	464,055
Direct costs	308,029			45,650		17,456			—			(17,757		)	353,378
Gross profit	60,839			40,810		10,006			—			(978		)	110,677
Selling, general and administrative expense	8,678			7,921		7,618			14,530			—			38,747
Operating income (loss) before charges	52,161			32,889		2,388			(14,530		)	(978		)	71,930
Net (gain) loss on sale or disposal of assets	(110		)	11		—			(10		)	—			(109		)
Operating income (loss)	$	52,271		$	32,878	$	2,388		$	(14,520	)	$	(978	)	$	72,039
Depreciation and amortization	$	15,037		$	2,554	$	2,087		$	816		$	(450	)	$	20,044
Capital expenditures	$	15,915		$	1,905	$	872		$	1,795		$	(900	)	$	19,587


9.	Lines of Business, continued



	Animal Hospital		Laboratory			All Other			Corporate			Eliminations			Total
Nine Months Ended September 30, 2014
External revenue	$	1,134,184	$	233,497		$	68,055		$	—		$	2,820		$	1,438,556
Intercompany revenue	—		42,895			13,859			—			(56,754		)	—
Total revenue	1,134,184		276,392			81,914			—			(53,934		)	1,438,556
Direct costs	953,511		139,245			54,161			—			(53,984		)	1,092,933
Gross profit	180,673		137,147			27,753			—			50			345,623
Selling, general and administrative expense	28,261		24,909			23,782			47,211			—			124,163
Operating income (loss) before charges	152,412		112,238			3,971			(47,211		)	50			221,460
Impairment of goodwill and other long-lived assets	—		—			27,019			—			—			27,019
Net loss (gain) on sale and disposal of assets	1,180		(71		)	(1,087		)	(195		)	—			(173		)
Operating income (loss)	$	151,232	$	112,309		$	(21,961	)	$	(47,016	)	$	50		$	194,614
Depreciation and amortization	$	45,053	$	7,769		$	5,921		$	2,333		$	(1,417	)	$	59,659
Capital expenditures	$	38,411	$	5,676		$	2,801		$	4,769		$	(1,564	)	$	50,093
Nine Months Ended September 30, 2013
External revenue	$	1,074,688	$	223,466		$	67,339		$	—		$	2,423		$	1,367,916
Intercompany revenue	—		41,559			16,118			—			(57,677		)	—
Total revenue	1,074,688		265,025			83,457			—			(55,254		)	1,367,916
Direct costs	908,537		136,524			54,394			—			(53,433		)	1,046,022
Gross profit	166,151		128,501			29,063			—			(1,821		)	321,894
Selling, general and administrative expense	25,723		23,891			24,573			43,429			—			117,616
Operating income (loss) before charges	140,428		104,610			4,490			(43,429		)	(1,821		)	204,278
Net loss (gain) on sale and disposal of assets	1,459		5			3			(280		)	—			1,187
Operating income (loss)	$	138,969	$	104,605		$	4,487		$	(43,149	)	$	(1,821	)	$	203,091
Depreciation and amortization	$	43,108	$	7,651		$	5,989		$	2,370		$	(1,335	)	$	57,783
Capital expenditures	$	41,682	$	5,641		$	3,244		$	3,741		$	(1,626	)	$	52,682

At September 30, 2014
Total assets	$	1,904,183	$	261,245		$	85,031		$	174,308		$	(152,282	)	$	2,272,485
At December 31, 2013
Total assets	$	1,854,609	$	247,591		$	96,245		$	77,153		$	(37,817	)	$	2,237,781