Restructuring (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Changes in restructuring liability
Balance at beginning of period	$ 421
Amounts charged to expense		21,586
Amounts paid	(200)	(4,527)
Non-cash expenses		(4,794)
Balance at end of period	221	12,265
Severance Expenses
Changes in restructuring liability
Balance at beginning of period	56
Amounts charged to expense		10,287
Amounts paid	(48)	(2,938)
Balance at end of period	8	7,349
Contract Termination Expenses
Changes in restructuring liability
Balance at beginning of period	365
Amounts charged to expense		5,532
Amounts paid	(152)	(1,514)
Balance at end of period	213	4,018
Asset Writedowns
Changes in restructuring liability
Amounts charged to expense		4,994
Non-cash expenses		(4,994)
Other Exit Expenses
Changes in restructuring liability
Amounts charged to expense		773
Amounts paid		(75)
Non-cash expenses		200
Balance at end of period		$ 898