19.QUARTERLY FINANCIAL DATA (unaudited)



	Quarter Ended
	December 31,		September 30,		June 30,		March 31,
	2018		2018		2018		2018
	(in thousands, except per share amounts)
Revenues	$	483,849	$	467,221	$	456,322	$	458,303
Operating income		150,321		138,006		125,870		129,969
Depreciation, accretion, and amortization		(169,454)		(167,703)		(169,558)		(165,398)
Loss from extinguishment of debt, net		—		—		(13,798)		(645)
Net income (loss)		57,152		16,144		(57,392)		31,547

Net income (loss) per common share - basic	$	0.50	$	0.14	$	(0.50)	$	0.27
Net income (loss) per common share - diluted		0.50		0.14		(0.50)		0.27

	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

(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 (loss) 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.