Income Taxes Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Taxes calculated at federal rate	$ 48,620	$ 48,592	$ 53,594
State taxes, net of federal benefit	7,896	9,863	12,475
Foreign taxes (less than) in excess of federal rate	(432)	(1,088)	(94)
Tax effect of noncontrolling interests	0	(10,521)	(17,633)
Non-deductible expenses, including Separation-related	636	6,436	463
Gain on disposition of subsidiary	11,367	0	0
Deferred tax on equity methos investment	12,285	0	0
Change in uncertain tax positions	4,588	1,351	570
Other items, net	1,440	3,432	96
Total current and deferred	$ 86,400	$ 58,065	$ 49,471
Effective Income Tax Rate, Continuing Operations	74.30%	41.80%	23.80%