Fair Value (Redeemable Noncontrolling Interest Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012
Fair Value [Abstract]
As of January 1, 2012	$ 235,909
Losses allocated to redeemable noncontrolling interests	(3,844)
Distributions to redeemable noncontrolling interests
Increase in fair value of redeemable noncontrolling interests charged to additional paid-in capital	644
Balance, March 31, 2012	$ 232,709

The portion of net income or loss for the period attributable to redeemable noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. This element should be used for redeemable noncontrolling interests that are classified within temporary equity.

No definition available.

Name:	us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration