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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

Stock option activity from January 1, 2018 to March 31, 2018 follows:

					Weighted
					Average
	Underlying				Exercise Price
	Shares				Per Share
Outstanding at January 1, 2018		6,037,150			$	20.35
Exercised		(40,000	)		$	12.12
Outstanding at March 31, 2018		5,997,150			$	20.41
Exercisable at March 31, 2018		5,610,625			$	20.52

Restricted Stock Activity

Restricted stock activity from January 1, 2018 to March 31, 2018 follows:

					Weighted
					Average Grant
					Date Fair Value
	Shares				Per Share
Non-vested restricted stock outstanding at January 1, 2018		1,530,338			$	21.41
Vested		(72,087	)		$	22.79
Forfeited		(100	)		$	20.85
Non-vested restricted stock outstanding at March 31, 2018		1,458,151			$	21.34

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2018 to March 31, 2018 follows:

					Weighted
					Average Grant
					Date Fair Value
	Shares				Per Share
Non-vested restricted stock units outstanding at January 1, 2018		1,337,273			$	19.80
Granted		397,340			$	18.44
Forfeited		(7,050	)		$	20.01
Non-vested restricted stock units outstanding at March 31, 2018		1,727,563			$	19.49

Performance Units

The total target number of shares with respect to the Performance Units for the awards granted in 2013-2017 is set forth below:

	2017				2016				2015				2014				2013
	Performance				Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards				Unit Awards
Target number of shares		186,198				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):

	2017				2016				2015				2014				2013
	Performance				Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards				Unit Awards
Fair value at date of grant	$	5,780			$	3,854			$	4,052			$	5,388			$	5,564

Compensation Expense Associated with Performance Units

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

	2017				2016				2015				2014				2013
	Performance				Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards				Unit Awards
Three months ended March 31, 2018	$	482			$	321			$	338			NA				NA
Three months ended March 31, 2017	NA				$	321			$	338			$	449			NA

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