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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

Stock option activity from January 1, 2018 to September 30, 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
Expired		(496,000	)		$	29.01
Outstanding at September 30, 2018		5,501,150			$	19.63
Exercisable at September 30, 2018		5,291,863			$	19.67

Restricted Stock Activity

Restricted stock activity from January 1, 2018 to September 30, 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		(1,021,465	)		$	21.46
Forfeited		(6,053	)		$	21.56
Non-vested restricted stock outstanding at September 30, 2018		502,820			$	21.31

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2018 to September 30, 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		2,081,065			$	18.95
Vested		(415,333	)		$	19.58
Forfeited		(95,567	)		$	19.52
Non-vested restricted stock units outstanding at September 30, 2018		2,907,438			$	19.23

Performance Units

The total target number of shares with respect to the Performance Units for the awards granted in 2014-2018 is set forth below:

	2018				2017				2016				2015				2014
	Performance				Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards				Unit Awards
Target number of shares		310,700				186,198				185,000				190,600				154,000

Fair Value of Performance Units

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

	2018				2017				2016				2015				2014
	Performance				Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards				Unit Awards
Fair value at date of grant	$	8,004			$	5,780			$	3,854			$	4,052			$	5,388

Compensation Expense Associated with Performance Units

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

	2018				2017				2016				2015				2014
	Performance				Performance				Performance				Performance				Performance
	Unit Awards				Unit Awards				Unit Awards				Unit Awards				Unit Awards
Three months ended September 30, 2018	$	667			$	482			$	321			NA				NA
Three months ended September 30, 2017	NA				$	482			$	321			$	338			NA
Nine months ended September 30, 2018	$	1,334			$	1,445			$	963			$	338			NA
Nine months ended September 30, 2017	NA				$	803			$	963			$	1,013			$	449

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