Restructuring Costs (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011
Activity in the restructuring cost liability accrual
Balance at the beginning of the year	$ 4,438	$ 0
Costs incurred	668	7,370
Costs paid	(2,619)	(2,932)
Balance at the end of the year	$ 2,487	$ 4,438