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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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 month period ended March 31, 2016 follow:

	Three Months Ended
	March 31,
	2016
Volatility		39.52	%
Expected term (in years)		5.00
Dividend yield		2.65	%
Risk-free interest rate		1.76	%

Stock Option Activity

Stock option activity from January 1, 2017 to March 31, 2017 follows:

					Weighted
					Average
	Underlying				Exercise Price
	Shares				Per Share
Outstanding at January 1, 2017		6,687,150			$	20.68
Exercised		(10,000	)		$	22.29
Outstanding at March 31, 2017		6,677,150			$	20.68
Exercisable at March 31, 2017		5,466,836			$	21.02

Restricted Stock Activity

Restricted stock activity from January 1, 2017 to March 31, 2017 follows:

					Weighted
					Average Grant
					Date Fair Value
	Shares				Per Share
Non-vested restricted stock outstanding at January 1, 2017		1,427,455			$	22.26
Granted		32,500			$	26.92
Vested		(53,021	)		$	23.54
Forfeited		(8,602	)		$	23.20
Non-vested restricted stock outstanding at March 31, 2017		1,398,332			$	22.31

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2017 to March 31, 2017 follows:

					Weighted
					Average Grant
					Date Fair Value
	Shares				Per Share
Non-vested restricted stock units outstanding at January 1, 2017		191,655			$	19.85
Forfeited		(852	)		$	19.03
Non-vested restricted stock units outstanding at March 31, 2017		190,803			$	19.86

Performance Units

The total target number of shares with respect to the Performance Units for the awards in 2013-2016 is set forth below:

	2016				2015				2014				2013
	Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards
Target number of shares		185,000				190,600				154,000				236,500

Fair Value of Performance Units

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

	2016				2015				2014				2013
	Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards
Fair value at date of grant	$	3,854			$	4,052			$	5,388			$	5,564

Compensation Expense Associated with Performance Units

These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Performance Units is shown below (in thousands):

	2016				2015				2014				2013
	Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards
Three months ended March 31, 2017	$	321			$	338			$	449			NA
Three months ended March 31, 2016	NA				$	338			$	449			$	464

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