Stock-based Compensation

The Company recognizes stock-based compensation expense for grants of stock option awards and restricted stock under the Company's applicable Long-Term Incentive Plan based on the grant-date fair value of those awards. The Company recognized stock-based compensation expense of $94.3 million and $64.8 million for the three months ended June 30, 2015 and 2014, respectively, and $198.0 million and $140.6 million for the six months ended June 30, 2015 and 2014, respectively.

Revisions of Previously-Issued Financial Statements

During the first quarter of 2015, the Company determined that for certain stock option awards granted to an employee in prior periods, the incorrect requisite service period was utilized in determining the period over which the related compensation expense should have been recorded. Such awards were made as part of the Company's annual employee option grants in December of each applicable year. As a result, compensation expense for the three months and years ended December 31, 2014 and 2013 was understated, and compensation expense for the three months ended March 31, 2014 and 2013, June 30, 2014 and 2013, and September 30, 2014 and 2013 was overstated. These revisions consisted entirely of non-cash adjustments, and therefore had no impact on the Company's previously reported total cash flows from operating activities and total cash flows in its Statements of Cash Flows. The Company evaluated the impact of these items on prior periods, assessing materiality quantitatively and qualitatively, and concluded that the errors were not considered to be material to any previously-issued quarterly or annual financial statements. However, the Company concluded that it would revise the applicable prior period amounts in this filing to reflect the impact of these corrections because the cumulative amount of such corrections is expected to be material to the year ending December 31, 2015. The Company's prior-period financial statements will reflect these revisions for the applicable periods presented in future filings.

The table below presents the impact of these revisions, including the related tax effect, on the Company's previously-filed financial statements.



	December 31, 2014
	As Previously Reported		Adjustments			As Revised
Balance Sheet Data:
Deferred tax assets (noncurrent)	$	266,869	$	22,152		$	289,021
Total assets	3,871,827		22,152			3,893,979
Additional paid-in capital	2,404,118		60,890			2,465,008
Retained earnings	255,382		(38,738		)	216,644
Total stockholders' equity	2,542,325		22,152			2,564,477
Total liabilities and stockholders' equity	3,871,827		22,152			3,893,979



	Three Months Ended June 30, 2014							Six Months Ended June 30, 2014
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised
Consolidated Statement of Operations Data:
Selling, general, and administrative	$	102,414	$	(5,684	)	$	96,730	$	211,264	$	(11,307	)	$	199,957
Total operating expenses	443,294		(5,684		)	437,610		883,095		(11,307		)	871,788
Income from operations	222,406		5,684			228,090		408,345		11,307			419,652
Income before income taxes	203,119		5,684			208,803		378,382		11,307			389,689
Income tax expense	110,384		2,068			112,452		220,204		4,829			225,033
Net income	92,735		3,616			96,351		158,178		6,478			164,656
Net income per share - basic	$	0.92	$	0.04		$	0.96	$	1.58	$	0.07		$	1.65
Net income per share - diluted	$	0.82	$	0.03		$	0.85	$	1.40	$	0.06		$	1.46



	Six Months Ended June 30, 2014
	As Previously Reported			Adjustments			As Revised
Consolidated Statement of Cash Flows Data:
Cash flows from operating activities
Net income	$	158,178		$	6,478		$	164,656
Non-cash compensation expense	151,920			(11,307		)	140,613
Deferred taxes	(32,543		)	4,829			(27,714		)

The tables below present the impact of these revisions, including the related tax effects, on additional previously-filed interim and year-end Consolidated Statements of Operations for the three and nine months ended September 30, 2014, and for the three months and year ended December 31, 2014.



	Three Months Ended September 30, 2014							Nine Months Ended September 30, 2014
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised
Selling, general, and administrative	$	149,748	$	(5,745	)	$	144,003	$	361,012	$	(17,052	)	$	343,960
Total operating expenses	543,069		(5,745		)	537,324		1,426,164		(17,052		)	1,409,112
Income from operations	182,719		5,745			188,464		591,064		17,052			608,116
Income before income taxes	176,078		5,745			181,823		554,460		17,052			571,512
Income tax expense	96,358		2,090			98,448		316,562		6,919			323,481
Net income	79,720		3,655			83,375		237,898		10,133			248,031
Net income per share - basic	$	0.79	$	0.04		$	0.83	$	2.37	$	0.10		$	2.47
Net income per share - diluted	$	0.70	$	0.03		$	0.73	$	2.10	$	0.09		$	2.19



	Three Months Ended December 31, 2014							Year Ended December 31, 2014
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised
Selling, general, and administrative	$	143,743	$	31,564		$	175,307	$	504,755	$	14,512		$	519,267
Total operating expenses	554,962		31,564			586,526		1,981,126		14,512			1,995,638
Income from operations	247,367		(31,564		)	215,803		838,431		(14,512		)	823,919
Income before income taxes	221,287		(31,564		)	189,723		775,747		(14,512		)	761,235
Income tax expense	111,111		(11,483		)	99,628		427,673		(4,564		)	423,109
Net income	110,176		(20,081		)	90,095		348,074		(9,948		)	338,126
Net income per share - basic	$	1.09	$	(0.20	)	$	0.89	$	3.46	$	(0.10	)	$	3.36
Net income per share - diluted	$	0.96	$	(0.18	)	$	0.78	$	3.07	$	(0.09	)	$	2.98