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Equity Method Investments Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]
Equity in losses of investments	$ (1,781)	$ (6,338)	$ (3,469)	$ (5,222)
INOVA Geophysical [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity method investment	49.00%		49.00%
Equity in losses of investments	$ (1,800)	$ (4,700)	$ (4,207)	$ (2,900)

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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