Restructuring (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012
Changes in restructuring liability
Amounts charged to expense	$ 1,917	$ 21,586	$ 23,503
Amounts paid			(18,036)
Non-cash expenses			(5,046)
Balance at end of period			421
Severance
Changes in restructuring liability
Amounts charged to expense			11,600
Amounts paid			(11,544)
Balance at end of period			56
Contract Termination
Changes in restructuring liability
Amounts charged to expense			5,840
Amounts paid			(5,475)
Balance at end of period			365
Asset Writedowns
Changes in restructuring liability
Amounts charged to expense			5,246
Non-cash expenses			(5,246)
Other Exit
Changes in restructuring liability
Amounts charged to expense			817
Amounts paid			(1,017)
Non-cash expenses			$ 200