Income Taxes - Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, lower bound	$ 0
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	140,000,000
Unrecognized tax benefits	180,237,000	193,189,000	234,181,000	276,566,000
Additions based on tax positions related to the current year	10,214,000	11,821,000	22,566,000
Additions for tax positions of prior years	7,598,000	16,607,000	15,258,000
Reductions for tax positions of prior years	14,282,000	52,865,000	46,599,000
Settlements	(503,000)	(10,142,000)	(25,956,000)
Lapse of statutes	15,979,000	6,413,000	7,654,000
Unrecognized potential tax benefits that would impact effective tax rate	104,900,000
Potential interest and penalty expense (income)	100,000	(9,100,000)	1,500,000
Accrued interest and penalties	25,000,000	34,200,000
Segment, Continuing Operations [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	126,035,000	138,944,000	166,906,000	184,896,000
Additions based on tax positions related to the current year	10,188,000	10,835,000	22,324,000
Additions for tax positions of prior years	4,128,000	14,636,000	15,183,000
Reductions for tax positions of prior years	14,257,000	40,563,000	39,824,000
Settlements	(418,000)	(6,673,000)	(8,152,000)
Lapse of statutes	12,550,000	6,197,000	7,521,000
Segment, Discontinued Operations [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	54,202,000	54,245,000	67,275,000	91,670,000
Additions based on tax positions related to the current year	26,000	986,000	242,000
Additions for tax positions of prior years	3,470,000	1,971,000	75,000
Reductions for tax positions of prior years	25,000	12,302,000	6,775,000
Settlements	(85,000)	(3,469,000)	(17,804,000)
Lapse of statutes	$ 3,429,000	$ 216,000	$ 133,000