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Goodwill (Details Textual) (USD $)	3 Months Ended		12 Months Ended
	Sep. 30, 2011	Jun. 30, 2009	Dec. 31, 2011	Dec. 31, 2009
Goodwill [Line Items]
Goodwill impairment	$ 196,100,000		$ 196,807,000	$ 150,778,000
Goodwill (Textual) [Abstract]
Amount of goodwill written off		32,600,000
International Contract Operations [Member]
Goodwill [Line Items]
Goodwill impairment		$ 150,800,000	$ 0

X

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill that is recorded in discontinued operations.

+ References

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- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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