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Stock-Based Compensation - Restricted Stock Units, Textuals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of units that vested	$ 442	$ 1,300	$ 2,200
RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Compensation expense	$ 3,500	2,800	1,800
Tax benefit	757	589	387
Total unrecognized compensation expense	$ 5,200
Weighted average, recognition period	2 years 3 months 18 days
Fair value of units that vested	$ 2,400	$ 2,000	$ 1,000
PRSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	4 years
PRSU | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout percentage	0.00%
PRSU | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout percentage	150.00%

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