Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

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	2018			2017			2016
Balance at January 1,		929,386			679,038			674,523
Granted		435,542			375,435			302,722
Forfeited		(112,501	)		(96,306	)		(148,232	)
Shares delivered		(495,641	)		(28,781	)		(149,975	)
Balance at December 31,		756,786			929,386			679,038

Compensation Expense for Stock Option Activity

	2018		2017		2016
Compensation expense	$	5,971	$	4,228	$	2,875

Stock Only Stock Appreciation Rights (SOSARs) [Member]

Summary of Share Based Compensation Activity

The following table sets forth information related to outstanding SOSARS:

	2018					2017					2016
SOSARS	Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price
Outstanding at January 1,		2,561,846		$	17.87		2,736,616		$	17.64		2,199,742		$	17.82
Granted		—			—		—			—		743,925		17.54
Exercised		(158,545	)		13.31		(157,140	)		13.76		(61,190	)		10.70
Canceled / forfeited		(68,559	)		21.09		(17,630	)		18.46		(145,861	)		22.80
Outstanding at December 31,		2,334,742		$	18.08		2,561,846		$	17.87		2,736,616		$	17.64
Exercisable at December 31,		2,134,297			18.13		2,011,075		17.56			1,740,591			16.19
Vested and expected to vest		2,334,742					2,561,846					2,725,611
SOSAR Grants
Weighted average grant date    fair value per share		—					—				$	4.07
Aggregate grant date    fair value (in thousands)		—					—				$	3,013
Black-Scholes assumptions
Dividend yield		—					—					2.85	%
Risk free rate of return		—					—					1.34	%
Volatility		—					—					31.97	%
Expected life		—					—				6
Compensation expense    (in thousands)	$	317				$	1,266				$	2,607