Fair Value Measurements (Details 2) (USD $)	3 Months Ended			12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total losses
Goodwill and other asset impairment	$ 274,285,000	$ 4,282,000	$ 225,035,000	$ 274,285,000	$ 229,317,000	$ 5,375,000
Equity investments					4,282,000
Total				274,285,000	229,317,000
Goodwill		274,292,000			274,292,000	468,479,000
Carrying value of equity method investment which was written off				4,300,000
U.S. Operations
Total losses
Goodwill and other asset impairment	274,300,000		225,000,000	245,103,000	225,035,000
Goodwill		245,105,000	470,100,000		245,105,000	439,294,000
European Operations
Total losses
Goodwill and other asset impairment				28,481,000
Goodwill		28,486,000			28,486,000	28,484,000
Asia Pacific Operations
Total losses
Goodwill and other asset impairment				701,000
Goodwill		701,000			701,000	701,000
Non-recurring basis | U.S. Operations | Total
Fair value measurements
Goodwill		245,118,000			245,118,000
Total		245,118,000			245,118,000
Non-recurring basis | U.S. Operations | Level 2
Fair value measurements
Goodwill		245,118,000			245,118,000
Total		$ 245,118,000			$ 245,118,000