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

 Number of shares
Non-vested stock awards outstanding at January 1, 20202,102,654  
Awarded:
Time-vesting shares275,173  
Performance-based shares166,018  
Released:
Time-vesting shares(140,987) 
Performance-based shares(181,705) 
Forfeitures:
       Time-vesting shares(56,566) 
Performance-based shares(7,651) 
Non-vested stock awards outstanding at June 30, 20202,156,936