Fair Value (Sensitivity Analysis Of Fair Value Of Redeemable Noncontrolling Interests Using Discount And Terminal Growth Rates) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 236,137	$ 235,909
Discount rate assumed in determining fair value	11.78%
Terminal growth rate assumed in determining fair value	2.00%
Rate 1.75% Terminal Growth Rates [Member] | Rate 11.53% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	240,500
Discount rate assumed in determining fair value	11.53%
Terminal growth rate assumed in determining fair value	1.75%
Rate 1.75% Terminal Growth Rates [Member] | Rate 11.78% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	233,200
Discount rate assumed in determining fair value	11.78%
Terminal growth rate assumed in determining fair value	1.75%
Rate 1.75% Terminal Growth Rates [Member] | Rate 12.03% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	226,300
Discount rate assumed in determining fair value	12.03%
Terminal growth rate assumed in determining fair value	1.75%
Rate 2.00% Terminal Growth Rates [Member] | Rate 11.53% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	243,600
Discount rate assumed in determining fair value	11.53%
Terminal growth rate assumed in determining fair value	2.00%
Rate 2.00% Terminal Growth Rates [Member] | Rate 11.78% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	236,100
Discount rate assumed in determining fair value	11.78%
Terminal growth rate assumed in determining fair value	2.00%
Rate 2.00% Terminal Growth Rates [Member] | Rate 12.03% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	229,000
Discount rate assumed in determining fair value	12.03%
Terminal growth rate assumed in determining fair value	2.00%
Rate 2.25% Terminal Growth Rates [Member] | Rate 11.53% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	246,900
Discount rate assumed in determining fair value	11.53%
Terminal growth rate assumed in determining fair value	2.25%
Rate 2.25% Terminal Growth Rates [Member] | Rate 11.78% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	239,200
Discount rate assumed in determining fair value	11.78%
Terminal growth rate assumed in determining fair value	2.25%
Rate 2.25% Terminal Growth Rates [Member] | Rate 12.03% Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 231,800
Discount rate assumed in determining fair value	12.03%
Terminal growth rate assumed in determining fair value	2.25%