Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option activity

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms (Years)	Aggregate Intrinsic Value
						(in millions)
Options outstanding at December 31, 2012	233,985		$	16.78
Granted	—		—
Exercised	(152,783	)	$	16.23
Cancelled	—		—
Options outstanding at December 31, 2013	81,202		$	17.80	3.3	$3.0
Options exercisable:
December 31, 2012	233,985		$	16.78	4.1	$4.5
December 31, 2013	81,202		$	17.80	3.3	$3.0

Schedule of restricted stock activity

	Number of Restricted Share Awards		Weighted Average Fair Value per Award
Restricted share awards outstanding at December 31, 2012	3,301,371		$	27.82
Granted	1,435,653		41.52
Vested	(729,782	)	25.95
Forfeited	(102,190	)	30.02
Restricted share awards outstanding at December 31, 2013	3,905,052		$	32.99