Item 6. SELECTED FINANCIAL DATA



	Year Ended December 31,

(In thousands, except per share amounts)	2017		2016		2015		2014		2013
Operating Data:
Revenue from operations	$	3,358,112	$	2,991,517	$	2,972,442	$	2,787,897	$	2,337,648
Depreciation and amortization expense	205,763		189,867		165,343		146,466		127,072
Total operating expenses	2,782,226		2,507,682		2,474,202		2,346,590		1,999,210
Operating income	575,886		483,835		498,240		441,307		338,438
Interest expense, net (1)	1,414		4,274		5,001		6,502		9,473
Provision for income taxes	112,058		181,822		185,327		165,000		122,573
Net income (2)	463,774		295,765		304,690		267,514		206,113

Per Share Data:
Basic earnings per share	$	5.63	$	3.56	$	3.57	$	3.10	$	2.39
Diluted earnings per share	$	5.63	$	3.56	$	3.57	$	3.10	$	2.39
Cash dividends per share	$	0.40	$	—	$	—	$	—	$	—

Balance Sheet Data:
Cash and cash equivalents	$	127,462	$	10,171	$	11,472	$	34,787	$	30,174
Current assets	584,653		382,622		381,730		403,772		309,730
Total assets	3,068,424		2,696,247		2,466,504		2,206,866		1,908,840
Current liabilities	351,049		288,636		285,402		255,638		232,122
Long-term debt (including current maturities)	95,000		104,975		133,805		155,714		191,429
Shareholders’ equity	2,276,854		1,851,158		1,684,637		1,494,064		1,232,082


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


(2)	Our 2017 net income includes a provisional tax benefit of $104.9 million due to the remeasurement of our deferred taxes to reflect the impact of the Tax Act.