Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]

Summary of Share Based Compensation Activity

The following table summarizes RSU and PSA activity during the past three years:

Units	2019			2018			2017
Balance at January 1,		756,786			929,386			679,038
Granted		600,820			435,542			375,435
Forfeited		(223,677	)		(112,501	)		(96,306	)
Shares delivered		(237,466	)		(495,641	)		(28,781	)
Balance at December 31,		896,463			756,786			929,386

Compensation Expense for Stock Option Activity

	2019		2018		2017
Compensation expense	$	3,543	$	5,971	$	4,228

Stock Only Stock Appreciation Rights (SOSARs) [Member]

Summary of Share Based Compensation Activity

The following table sets forth information related to outstanding SOSARS:

	2019					2018					2017
SOSARS	Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price
Outstanding at January 1,		2,334,742		$	18.08		2,561,846		$	17.87		2,736,616		$	17.64
Granted		—			—		—			—		—			—
Exercised		(596,360	)		15.56		(158,545	)		13.31		(157,140	)		13.76
Canceled / forfeited		(446,435	)		21.06		(68,559	)		21.09		(17,630	)		18.46
Outstanding at December 31,		1,291,947		$	20.05		2,334,742		$	18.08		2,561,846		$	17.87
Exercisable at December 31,		1,291,947			20.05		2,134,297		18.13			2,011,075			17.56
Vested and expected to vest		1,291,947					2,334,742					2,561,846
Compensation expense    (in thousands)	$	40				$	317				$	1,266