Item 6. SELECTED FINANCIAL DATA



	Year Ended December 31,
(In thousands, except per share amounts)
	2016		2015		2014		2013		2012
Operating Data:
Revenue from operations	$	2,991,517	$	2,972,442	$	2,787,897	$	2,337,648	$	2,134,579
Depreciation and amortization expense	189,867		165,343		146,466		127,072		110,743
Total operating expenses	2,507,682		2,474,202		2,346,590		1,999,210		1,849,325
Operating income	483,835		498,240		441,307		338,438		285,254
Interest expense, net (1)	4,274		5,001		6,502		9,473		11,428
Provision for income taxes	181,822		185,327		165,000		122,573		103,646
Net income	295,765		304,690		267,514		206,113		169,452

Per Share Data:
Basic earnings per share	$	3.56	$	3.57	$	3.10	$	2.39	$	1.97
Diluted earnings per share	$	3.56	$	3.57	$	3.10	$	2.39	$	1.97

Balance Sheet Data:
Cash and cash equivalents	$	10,171	$	11,472	$	34,787	$	30,174	$	12,857
Current assets	382,622		381,730		403,772		309,730		254,974
Total assets	2,696,247		2,466,504		2,206,866		1,908,840		1,692,460
Current liabilities	288,636		285,402		255,638		232,122		225,139
Long-term debt (including current maturities)	104,975		133,805		155,714		191,429		240,407
Shareholders’ equity	1,851,158		1,684,637		1,494,064		1,232,082		1,025,969


(1)	For the purpose of this table, interest expense is presented net of interest income.