Condensed Consolidated Statements of Shareholders Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2013	$ 3,953,118	$ 3,713	$ 1,250,178	$ 2,699,227
Balance, shares at Dec. 31, 2013	371,317,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	863,293
Stock-based compensation (unaudited)	39,409		39,409
Restricted stock:
Issued (unaudited)	12	12
Issued (unaudited), shares		1,251,264
Repurchased and canceled (unaudited)	(7,618)	(1)	(7,617)
Repurchased and canceled (unaudited), shares		(117,314)
Forfeited (unaudited), shares		(404,900)
Forfeitures (unaudited), value	(4)	(4)
Common Stock, Shares, Issued	372,046,368
Balance at Sep. 30, 2014	$ 4,848,210	$ 3,720	$ 1,281,970	$ 3,562,520
Balance, shares at Sep. 30, 2014	372,046,368