CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND COMPREHENSIVE INCOME
Net income attributable to redeemable noncontrolling interest	$ 1,120	$ 1,230

Name:

us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest

Namespace Prefix:

us-gaap

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

duration