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Stock-Based Compensation - 2013 Long-Term Incentive Plan (Details) - LTIP - Common Stock
12 Months Ended
Dec. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
LTIP expiration period 10 years
Common stock, reserved for future issuance (in shares) 20,000,000
Common stock, shares available for future issuance (in shares) 9,031,242