Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

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	2020			2019			2018
Balance at January 1,		896,463			756,786			929,386
Granted		400,854			600,820			435,542
Forfeited		(89,483	)		(223,677	)		(112,501	)
Shares delivered		(136,182	)		(237,466	)		(495,641	)
Balance at December 31,		1,071,652			896,463			756,786

Compensation Expense for Stock Option Activity

	2020		2019		2018
Compensation expense	$	5,655	$	3,543	$	5,971

Stock Only Stock Appreciation Rights (SOSARs) [Member]

Summary of Share Based Compensation Activity

The following table sets forth information related to outstanding SOSARS:

	2020					2019					2018
SOSARS	Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price
Outstanding at January 1,		1,291,947		$	20.05		2,334,742		$	18.08		2,561,846		$	17.87
Granted		—			—		—			—		—			—
Exercised		(58,460	)		12.85		(596,360	)		15.56		(158,545	)		13.31
Canceled / forfeited		(151,074	)		20.25		(446,435	)		21.06		(68,559	)		21.09
Outstanding at December 31,		1,082,413		$	20.40		1,291,947		$	20.05		2,334,742		$	18.08
Exercisable at December 31,		1,082,413			20.40		1,291,947		20.05			2,134,297			18.13
Vested and expected to vest		1,082,413					1,291,947					2,334,742
Compensation expense (in thousands)	$	—				$	40				$	317