19.QUARTERLY FINANCIAL DATA (unaudited)



	Quarter Ended
	December 31,		September 30,		June 30,		March 31,
	2017		2017		2017		2017
	(in thousands, except per share amounts)
Revenues	$	443,073	$	433,945	$	427,294	$	423,362
Operating income		119,081		117,011		114,590		107,819
Depreciation, accretion, and amortization		(162,643)		(161,907)		(159,520)		(159,030)
Loss from extinguishment of debt, net		—		—		(1,961)		—
Net income		7,660		49,161		9,233		37,600

Net income per common share - basic (1)	$	0.07	$	0.41	$	0.08	$	0.31
Net income per common share - diluted		0.06		0.41		0.08		0.31

	Quarter Ended
	December 31,		September 30,		June 30,		March 31,
	2016		2016		2016		2016
	(in thousands, except per share amounts)
Revenues	$	416,505	$	411,319	$	405,532	$	399,769
Operating income		107,430		108,210		74,066		97,602
Depreciation, accretion, and amortization		(158,554)		(160,111)		(159,723)		(159,801)
Loss from extinguishment of debt, net		(18,189)		(34,512)		—		—
Net income (loss)		5,256		(15,370)		32,711		53,641

Net income per common share - basic	$	0.04	$	(0.12)	$	0.26	$	0.43
Net income per common share - diluted		0.04		(0.12)		0.26		0.43

(1)

The sums of quarterly earnings per share data may not equal annual data due to rounding.

Basic and diluted net income (loss) per share is computed by dividing net income by the weighted average number of shares for the period. Potentially dilutive instruments have been excluded from the computation of diluted loss per share as their impact would have been anti-dilutive.

Because net income (loss) per share amounts are calculated using the weighted average number of common and dilutive common shares outstanding during each quarter, the sum of the per share amounts for the four quarters may not equal the total loss per share amounts for the year.