Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Deferred Compensation Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Liability [Roll Forward]
Beginning deferred compensation liability balance	$ 1,392	$ 1,749
Employee contributions	276	370
Company matching contributions	150	198
Distributions	(193)	(806)
Participant earnings (losses)	408	(119)
Ending deferred compensation liability balance	2,033	1,392
Deferred Compensation Liability [Abstract]
Amount to be paid within one year	844	94
Remaining balance to be paid beyond one year	$ 1,189	$ 1,298