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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Share-based Compensation [Abstract]  
Summary of Restricted Stock Transactions
A summary of restricted stock transactions during the nine months ended September 30, 2016 follows:
 
Number of shares
Non-vested stock awards outstanding at January 1, 2016
1,778,275

Awarded:

Time-vesting shares
127,167

Performance-based shares
137,374

Released:

Time-vesting shares
(412,889
)
Performance-based shares
(90,003
)
Forfeitures:
 
        Time-vesting shares
(46,667
)
Performance-based shares
(161,415
)
Non-vested stock awards outstanding at September 30, 2016
1,331,842