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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data Details
Revenues	$ 54,451	$ 39,202	$ 36,505	$ 25,434	$ 27,184	$ 27,019	$ 53,517	$ 22,924	$ 155,592	$ 130,644	$ 101,645
Operating (loss) income	10,588	1,769	(9,321)	(4,531)	(8,018)	733	11,206	(5,045)	(1,495)	(1,124)	545
Net (loss) income	$ 7,768	$ (1,087)	$ (12,389)	$ (7,796)	$ (12,203)	$ (3,324)	$ 7,355	$ (10,563)
Basic net income (loss) per common and potential common share	$ 0.08	$ (0.01)	$ (0.13)	$ (0.09)	$ (0.14)	$ (0.04)	$ 0.08	$ (0.12)	$ (0.14)	$ (0.22)	$ (0.45)
Diluted net income (loss) per common and potential common share	$ 0.07	$ (0.01)	$ (0.13)	$ (0.09)	$ (0.14)	$ (0.04)	$ 0.08	$ (0.12)	$ (0.14)	$ (0.22)	$ (0.45)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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