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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Weighted-Average Assumptions Used to Estimate Grant Date Fair Values for Stock Options Granted

Weighted-average assumptions used to estimate the grant date fair values for stock options granted for the three and nine month periods ended September 30, 2014 and 2013 follow:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014				2013		2014				2013
Volatility		35.64	%		NA			35.89	%			41.36	%
Expected term (in years)		5.00			NA			5.00				5.00
Dividend yield		1.18	%		NA			1.17	%			0.89	%
Risk-free interest rate		1.62	%		NA			1.76	%			0.70	%

Stock Option Activity

Stock option activity from January 1, 2014 to September 30, 2014 follows:

					Weighted
					Average
	Underlying				Exercise
	Shares				Price
Outstanding at January 1, 2014		7,319,695			$	21.23
Granted		491,750			$	32.32
Exercised		(1,715,195	)		$	20.59
Cancelled		—			$	—
Expired		—			$	—
Outstanding at September 30, 2014		6,096,250			$	22.30
Exercisable at September 30, 2014		5,117,764			$	21.48

Restricted Stock Activity

Restricted stock activity from January 1, 2014 to September 30, 2014 follows:

					Weighted
					Average
					Grant Date
	Shares				Fair Value
Non-vested restricted stock outstanding at January 1, 2014		1,496,692			$	20.84
Granted		778,100			$	33.40
Vested		(713,210	)		$	21.75
Forfeited		(45,616	)		$	23.43
Non-vested restricted stock outstanding September 30, 2014		1,515,966			$	26.79

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2014 to September 30, 2014 follows:

					Weighted
					Average
					Grant Date
	Shares				Fair Value
Non-vested restricted stock units outstanding at January 1, 2014		20,256			$	20.67
Granted		21,550			$	34.67
Vested		(9,754	)		$	22.13
Forfeited		(667	)		$	21.09
Non-vested restricted stock units outstanding September 30, 2014		31,385			$	29.82

Stock-Settled Performance Units

The total target number of shares with respect to the Stock-Settled Performance Units is set forth below:

	2014				2013				2012				2011
	Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards
Target number of shares		154,000				236,500				192,000				144,375

Fair Value of Stock-Settled Performance Units

The fair value of the Stock-Settled Performance Units is set forth below (in thousands):

	2014				2013				2012				2011
	Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards
Fair value at date of grant	$	5,388			$	5,564			$	3,065			$	5,569

Compensation expense associated with the Stock-Settled Performance Units is shown below (in thousands):

Compensation Expense Associated with Stock-Settled Performance Units

	2014				2013				2012				2011
	Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards
Three months ended September 30, 2013	NA				$	464			$	255			$	464
Three months ended September 30, 2014	$	449			$	464			$	255			NA
Nine months ended September 30, 2013	NA				$	927			$	766			$	1,392
Nine months ended September 30, 2014	$	898			$	1,391			$	766			$	464

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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