Equity Compensation Plans - Summary of Activity Related to Executive Deferred Compensation Plan (Details) - Executive Deferred Compensation Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent [Roll Forward]
Balance at beginning of period	$ 2,484	$ 2,171	$ 2,088
New deferrals	789	759	750
Accrued interest	68	82	58
Withdrawals	(887)	(528)	(725)
Balance at End of Period	$ 2,454	$ 2,484	$ 2,171