Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity Note [Abstract]

Changes To Equity

Shares of our common stock outstanding and activity for the years ended December 31, 2012, 2011 and 2010 are presented below:

	Years Ended December 31,
	2012		2011		2010
	(In thousands)
Common shares outstanding at January 1	209,332,646		106,529,376		106,132,538
Common shares issued in connection with merger with Frontier	—		103,270,002		—
Issuance of common shares upon exercise of stock options	—		—		80,400
Issuance of restricted stock, excluding restricted stock with performance feature	691,207		512,880		282,886
Vesting of performance units	869,231		233,134		140,286
Vesting of restricted stock with performance feature	146,400		124,332		12,300
Forfeitures of restricted stock	(3,975	)	(3,730	)	(30,084	)
Purchase of treasury stock (1)	(7,484,013	)	(1,333,348	)	(88,950	)
Common shares outstanding at December 31	203,551,496		209,332,646		106,529,376

(1) Includes 560,484, 747,225 and 88,950 shares, respectively, withheld under the terms of stock-based compensation agreements to provide funds for the payment of payroll and income taxes due at the vesting of share-based awards.