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Stock Incentive Plans - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Awards expected to vest in 2021 (in shares) 244,490    
Awards expected to vest in 2022 (in shares) 139,307    
Awards expected to vest in 2023 (in shares) 173,476    
Unrecognized compensation cost $ 3,300,000    
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 24 months    
Compensation expense $ 2,600,000 $ 2,600,000 $ 3,100,000
Number of shares, vested (in shares) 237,866 310,117 287,148
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Awards expected to vest in 2021 (in shares) 290,927    
Awards expected to vest in 2022 (in shares) 269,224    
Awards expected to vest in 2023 (in shares) 352,035    
Unrecognized compensation cost $ 3,400,000    
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 22 months    
Compensation expense $ 2,700,000 $ 2,400,000 $ 1,900,000
Performance period (in years) 3 years    
Percentage of target award of maximum possible payout to executives 150.00%    
Compensation expense, forfeitures     $ 1,000,000.0
Number of shares, vested (in shares) 245,937 251,375 218,514
Performance Shares | Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of total stockholder return for payout of shares 30.00%    
Percentage of target award of maximum possible payout to executives 150.00%    
Long-Term Incentive Plan Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards expected to vest in 2021 (in shares) 108,421    
Awards expected to vest in 2022 (in shares) 108,422    
Awards expected to vest in 2023 (in shares) 26,966    
Unrecognized compensation cost $ 1,600,000    
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 18 months    
Compensation expense $ 1,100,000 $ 700,000 $ 0
Number of shares, vested (in shares) 81,455    
2016 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option and Incentive plan, shares authorized (in shares) 6,082,664    
Number of shares issued or committed to issue (in shares) 3,054,825    
Maximum | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of total stockholder return for payout of shares 30.00%    
Minimum | Performance Shares | Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of total stockholder return for payout of shares 75.00%