Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Data

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

	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 and discontinued operations		20,158		28,555			14,654		61,633
(Provision) benefit for income taxes		484		(576	)		463		1,096
Income from continuing operations		20,642		27,979			15,117		62,729
Income (loss) from discontinued operations, net of taxes		11		12			13		(51	)
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

	2013
	First Quarter			Second Quarter		Third Quarter			Fourth Quarter
Revenues	$	222,113		$	245,183	$	221,196		$	266,070
Depreciation and amortization		32,009			29,054		27,916			27,549
Operating income (loss)		(2,244	)		28,903		19,803			29,726
Income (loss) before income taxes and discontinued operations		(12,522	)		14,584		5,783			17,970
Benefit for income taxes		66,292			1,784		12,450			12,136
Income from continuing operations		53,770			16,368		18,233			30,106
Income (loss) from discontinued operations, net of taxes		10			11		(202	)		56
Net income		53,780			16,379		18,031			30,162
Net income available to common stockholders		53,780			11,510		18,031			30,162
Net income per share		1.03			0.22		0.36			0.60
Net income per share — assuming dilution		0.81			0.18		0.30			0.48