Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Activity Under Stock Plan

The fair value of SARs granted under the Equity Plan (or its predecessor) during each of the years ended December 31, 2019, 2018 and 2017 was estimated using the Black Scholes pricing model with the following weighted average assumptions:

	Year Ended December 31,
	2019			2018			2017
Expected life of SARs (in years)		7			7			7
Expected volatility		39.35	%		32.10	%		31.70	%
Risk free interest rate		2.11	%		2.56	%		2.09	%

Weighted Average Assumptions Used in Estimating Fair Value of Options and SARs

A summary of SARs activity under the Equity Plan as of December 31, 2019 and changes during the year then ended is as follows:

	Number of Awards			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (In Thousands)
Awards outstanding at January 1, 2019		1,029,082		$	54.08
Granted		28,000		$	8.57
Expired		(134,852	)	$	71.46
Awards outstanding at December 31, 2019		922,230		$	50.19		3.6	$	—
Awards exercisable at December 31, 2019		922,230		$	50.19		3.6	$	—

Time-vesting RSUs [Member]

Summary of Restricted Stock Units Awarded Under Equity Plan

A summary of activity for time-vesting RSUs under the Equity Plan as of December 31, 2019 and changes during the year then ended is as follows:

	Number of Awards			Weighted -Average Grant Date Fair Value Per Share
Nonvested awards at January 1, 2019		422,059		$	16.57
Granted		310,700		$	10.47
Vested		(174,774	)	$	18.20
Forfeited		(24,382	)	$	13.42
Nonvested awards at December 31, 2019		533,603		$	12.58

Performance-Vesting RSUs [Member]

Summary of Restricted Stock Units Awarded Under Equity Plan

A summary of activity for performance-vesting RSUs under the Equity Plan as of December 31, 2019 and changes during the year then ended is as follows:

	Number of Awards			Weighted -Average Grant Date Fair Value Per Share
Nonvested awards at January 1, 2019		741,973		$	17.53
Granted		190,634		$	10.49
Vested		(223,330	)	$	21.44
Nonvested awards at December 31, 2019		709,277		$	14.41