CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	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
Repayment of employee loans	519		519
Stock issued in connection with employee incentive compensation plans	69		69
Stock issued in connection with employee incentive compensation plans, shares		4,000
Capital contribution received from shareholder	48,275		48,275
Net income	288,859				290,402	(1,543)
Other comprehensive income, net of taxes	1,378			1,378
Balance at Mar. 31, 2013	2,578,566	3,462	1,384,435	(7,786)	1,160,066	38,389
Balance, shares at Mar. 31, 2013		346,169,000
Balance at Dec. 31, 2013	2,686,832	3,468	1,409,463	(2,853)	1,276,754
Balance, shares at Dec. 31, 2013	346,760,107	346,760,000
Stock issued in connection with employee incentive compensation plans	16,410	20	16,390
Stock issued in connection with employee incentive compensation plans, shares		2,007,000
Stock based compensation expense	121,222		121,222
Net income	81,466				81,466
Other comprehensive income, net of taxes	2,088			2,088
Balance at Mar. 31, 2014	$ 2,908,018	$ 3,488	$ 1,547,075	$ (765)	$ 1,358,220
Balance, shares at Mar. 31, 2014	348,767,179	348,767,000