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

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

Awarded:

Time-vesting shares
1,493,093

Performance-based shares
142,154

Released:

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

Forfeitures:
 
       Time-vesting shares
(7,300
)
Performance-based shares
(159,738
)
Non-vested stock awards outstanding at June 30, 2018
2,168,496