CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interests
Balance at Dec. 31, 2012	$ 2,239,466	$ 3,462	$ 1,335,572	$ (9,164)	$ 869,664	$ 39,932
Balance, shares at Dec. 31, 2012		346,165,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repayment of employee loans	519		519
Stock issued in connection with employee incentive compensation plans, shares		4,000
Stock issued in connection with employee incentive compensation plans	69		69
Capital contribution received from shareholder	48,275		48,275
Net income	472,320				472,320
Net income	469,923					(2,397)
Other comprehensive income, net of taxes	2,212			2,212
Dividends	(290,401)				(290,401)
Balance at Jun. 30, 2013	2,470,063	3,462	1,384,435	(6,952)	1,051,583	37,535
Balance, shares at Jun. 30, 2013		346,169,000
Balance at Dec. 31, 2013	2,686,832	3,468	1,409,463	(2,853)	1,276,754	0
Balance, shares at Dec. 31, 2013	346,760,167	346,760,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued in connection with employee incentive compensation plans, shares		2,168,000
Stock issued in connection with employee incentive compensation plans	18,260	21	18,239
Capital contribution received from shareholder	0
Net income	327,947				327,947
Net income	327,947
Stock based compensation expense	122,811		122,811
Other comprehensive income, net of taxes	(1,276)			(1,276)
Dividends	(52,316)				(52,316)
Balance at Jun. 30, 2014	$ 3,102,258	$ 3,489	$ 1,550,513	$ (4,129)	$ 1,552,385	$ 0
Balance, shares at Jun. 30, 2014	348,928,336	348,928,000