Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

	Quarters Ended
	December 31			September 30			June 30		March 31
2014
Operating revenues	$	15,676		$	23,947		$	68,164	$	594,086
Operating income (loss)	$	(15,946	)	$	(1,335	)	$	21,038	$	509,493
Net income (loss) attributable to the Company	$	(11,101	)	$	(50	)	$	14,609	$	402,995
Basic and diluted income (loss) per share attributable to the Company	$	(0.13	)	$	—		$	0.16	$	4.37
2013
Operating revenues	$	33,868		$	36,827		$	33,788	$	26,773
Operating income (loss)	$	(1,964	)	$	3,383		$	1,583	$	(2,225	)
Net income (loss) attributable to the Company	$	562		$	4,198		$	2,704	$	(2,474	)
Basic and diluted income (loss) per share attributable to the Company	$	—		$	0.05		$	0.03	$	(0.03	)