Segment Information Measurement of Segment Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net segment income	$ 56,167	$ 67,739	$ 108,431	$ 132,250
Transaction Costs	(1,838)	0	(1,838)	0
Restructuring costs	0	(167)	0	(303)
Consolidated income before income taxes and discontinued operations	4,874	19,339	7,921	35,575
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net segment income	6,712	19,506	9,759	35,878
Transaction Costs	(1,838)	0	(1,838)	0
Restructuring costs	$ 0	$ (167)	$ 0	$ (303)