Stock Award Plans (Summary Of Stock Options Outstanding) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	7 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	May 31, 2010	May 31, 2009
Stock Award Plans [Abstract]
Options Outstanding, beginning balance	3,270	7,675	4,222
Options Outstanding, Options exercised	(1,382)	(3,469)	(732)
Options Outstanding, Options assumed	5,865
Options Outstanding, Options forfeited	(78)	(230)	(220)
Options Outstanding, ending balance	7,675	3,976	3,270
Weighted-Average Exercise Price, Outstanding, beginning balance	$ 3.42	$ 10.46	$ 5.17
Weighted-Average Exercise Price, Outstanding, Options exercised	$ 7.43	$ 10.21	$ 7.79
Weighted-Average Exercise Price, Outstanding, Options assumed	$ 13.64
Weighted-Average Exercise Price, Outstanding, Options forfeited	$ 8.38	$ 14.49	$ 18.56
Weighted-Average Exercise Price, Outstanding, ending balance	$ 10.46	$ 10.31	$ 3.42
Options Exercisable	6,434	3,499	3,270	4,222
Weighted-Average Exercise Price, Exercisable	$ 9.80	$ 9.87	$ 3.42	$ 5.17