Quarterly Financial Data

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data [Abstract]

Quarterly Financial Data

19.QUARTERLY FINANCIAL DATA (unaudited)

	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 (loss) per common share - basic	$	0.04	$	(0.12)	$	0.26	$	0.43
Net income (loss) per common share - diluted		0.04		(0.12)		0.26		0.43
	Quarter Ended
	December 31,		September 30,		June 30,		March 31,
	2015		2015		2015		2015
	(in thousands, except per share amounts)
Revenues	$	406,941	$	410,735	$	410,704	$	410,094
Operating income		82,129		43,083		98,163		89,081
Depreciation, accretion, and amortization		(161,461)		(164,330)		(162,377)		(171,853)
Loss from extinguishment of debt, net		(783)		—		—		—
Net income (loss)		31,019		(155,946)		28,305		(79,034)
Net income (loss) per common share - basic	$	0.25	$	(1.23)	$	0.22	$	(0.61)
Net income (loss) per common share - diluted		0.24		(1.23)		0.22		(0.61)

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.