CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Tax Effect	$ 0	$ 9,798	$ 0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	399	0	0
Exercise of stock options, tax	888	474	(258)
Proceeds from disgorgement of stockholder short-swing profits, tax	$ 6	$ 29	$ 3