Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

	Quarters Ended
	December 31			September 30		June 30			March 31
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	)
2012
Operating revenues	$	22,614		$	55,907	$	30,357		$	30,518
Operating income (loss)	$	(9,258	)	$	15,360	$	(2,367	)	$	(1,601	)
Net income (loss) attributable to the Company	$	(8,630	)	$	15,340	$	176		$	(874	)
Basic and diluted income (loss) per share attributable to the Company	$	(0.09	)	$	0.17	$	—		$	(0.01	)