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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary of Restricted Stock Transactions
A summary of restricted and deferred stock transactions during the nine months ended September 30, 2020 is as follows:

 Number of shares
Non-vested stock awards outstanding at January 1, 20202,102,654 
Awarded:
Time-vesting shares284,093 
Performance-based shares166,018 
Released:
Time-vesting shares(142,481)
Performance-based shares(181,705)
Forfeitures:
       Time-vesting shares(80,421)
Performance-based shares(7,651)
Non-vested stock awards outstanding at September 30, 20202,140,507