Quarterly Results of Operations (unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Results of Operations (unaudited) [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The following table summarizes quarterly financial data for the years ended December 31, 2014 and 2013 (in thousands, except per share data):

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
Year ended December 31, 2014
Revenues	$	239,034		$	259,812		$	273,267		$	283,110		$	1,055,223
Income (loss) from operations	17,935			21,917			32,804			(48,672		)	23,984
Income tax (expense) benefit	(37		)	1,070			(9,927		)	20,198			11,304
Net income (loss)	(2,579		)	(319		)	12,453			(47,573		)	(38,018		)
Earnings (loss) per share:
Basic	$	(0.04	)	$	(0.01	)	$	0.20		$	(0.75	)	$	(0.60	)
Diluted	$	(0.04	)	$	(0.01	)	$	0.19		$	(0.75	)	$	(0.60	)
Year ended December 31, 2013
Revenues	$	229,670		$	248,354		$	243,979		$	238,183		$	960,186
Income (loss) from operations	10,445			(27,268		)	1,870			8,724			(6,229		)
Income tax (expense) benefit	546			14,953			3,614			733			19,846
Net income (loss)	(1,292		)	(25,895		)	(6,230		)	(2,515		)	(35,932		)
Earnings (loss) per share:
Basic	$	(0.02	)	$	(0.42	)	$	(0.10	)	$	(0.04	)	$	(0.58	)
Diluted	$	(0.02	)	$	(0.42	)	$	(0.10	)	$	(0.04	)	$	(0.58	)