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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Share-based Compensation [Abstract]  
Summary of Restricted Stock Transactions
A summary of restricted and deferred stock transactions during the three months ended March 31, 2019 is as follows:

 
Number of shares
Non-vested stock awards outstanding at January 1, 2019
2,142,743

Awarded:

Time-vesting shares
108,525

Performance-based shares
202,876

Released:

Time-vesting shares
(68,923
)
Forfeitures:
 
       Time-vesting shares
(12,000
)
Performance-based shares
(129,207
)
Non-vested stock awards outstanding at March 31, 2019
2,244,014