Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Data

The following is selected unaudited quarterly financial data for the fiscal years ended December 31, 2015 and 2014 (amounts in thousands, except per share data).

The sum of the quarterly per share amounts may not equal the annual totals due to rounding.

	2015
	First Quarter			Second Quarter			Third Quarter		Fourth Quarter
Revenues	$	253,148		$	274,036		$	252,820	$	312,120
Depreciation and amortization		28,570			28,399			28,498		28,916
Operating income		35,890			57,015			32,768		36,389
Income before income taxes		4,853			42,255			22,079		30,469
(Provision) benefit for income taxes		(321	)		(866	)		4,612		8,430
Net income		4,532			41,389			26,691		38,899
Net income available to common stockholders		4,532			41,389			26,691		38,899
Net income per share		0.09			0.81			0.52		0.76
Net income per share — assuming dilution		0.09			0.80			0.52		0.75
	2014
	First Quarter			Second Quarter			Third Quarter		Fourth Quarter
Revenues	$	246,451		$	257,913		$	245,015	$	291,612
Depreciation and amortization		28,003			28,232			28,033		28,010
Operating income		32,797			47,486			29,083		43,739
Income before income taxes		20,169			28,567			14,667		61,582
(Provision) benefit for income taxes		484			(576	)		463		1,096
Net income		20,653			27,991			15,130		62,678
Net income available to common stockholders		20,653			23,039			15,130		62,213
Net income per share		0.41			0.45			0.30		1.22
Net income per share - assuming dilution		0.32			0.38			0.25		1.21