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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Share-based Compensation [Abstract]  
Summary of Restricted Stock Transactions
A summary of restricted stock transactions during the nine months ended September 30, 2018 is as follows:

 
Number of shares
Non-vested stock awards outstanding at January 1, 2018
1,053,842

Awarded:

Time-vesting shares
1,515,700

Performance-based shares
150,069

Released:

Time-vesting shares
(353,555
)
Performance-based shares
—

Forfeitures:
 
       Time-vesting shares
(35,625
)
Performance-based shares
(159,738
)
Non-vested stock awards outstanding at September 30, 2018
2,170,693