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Restructuring Activities	6 Months Ended
Jun. 30, 2012
Restructuring Activities [Abstract]
Restructuring Activities	(11) Restructuring Activities At December 31, 2011, the Company had a liability (classified as other long-term liability) of $5.9 million related to its permanently ceasing to use certain leased building facilities in March 2010. During the six months ended June 30, 2012, the Company made cash payments of $0.6 million and accrued $0.2 million related to accretion expense, resulting in a remaining liability of $5.5 million as of June 30, 2012. In the fourth quarter of 2011, the Company initiated a restructuring of its Sensor geophone operations in the Netherlands, which included reducing headcount at this location by approximately 30%. As of December 31, 2011, the Company had accrued a liability of $2.4 million associated with severance costs for these employees and recorded the corresponding expense within general and administrative expenses for 2011. During the six months ended June 30, 2012, the Company made cash severance payments of $1.8 million, resulting in a remaining liability of $0.6 million as of June 30, 2012.

Restructuring Activities

6 Months Ended

Jun. 30, 2012

(11) Restructuring Activities

At December 31, 2011, the Company had a liability (classified as other long-term liability) of $5.9 million related to its permanently ceasing to use certain leased building facilities in March 2010. During the six months ended June 30, 2012, the Company made cash payments of $0.6 million and accrued $0.2 million related to accretion expense, resulting in a remaining liability of $5.5 million as of June 30, 2012.

In the fourth quarter of 2011, the Company initiated a restructuring of its Sensor geophone operations in the Netherlands, which included reducing headcount at this location by approximately 30%. As of December 31, 2011, the Company had accrued a liability of $2.4 million associated with severance costs for these employees and recorded the corresponding expense within general and administrative expenses for 2011. During the six months ended June 30, 2012, the Company made cash severance payments of $1.8 million, resulting in a remaining liability of $0.6 million as of June 30, 2012.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

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