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Warrants and Restricted Stock Units (Tables)
 6 Months Ended
Jun. 30, 2017
Warrants and Rights Note Disclosure [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes restricted stock and restricted stock units activity:
 
Three Months Ended June 30, 2017
 
Six Months Ended June 30, 2017
 
Shares
 
Weighted — Average Grant-Date Fair Value per Share
 
Shares
 
Weighted — Average Grant-Date Fair Value per Share
Restricted Stock
 
 
 
 
 
 
 
Non-vested balance at beginning of period
1,465,893

 
$
18.00

 
1,461,910

 
$
17.68

Granted
240,446

 
29.06

 
326,338

 
28.41

Vested
(134,229
)
 
17.54

 
(213,941
)
 
18.96

Canceled and forfeited
(116,783
)
 
17.85

 
(118,980
)
 
17.93

Non-vested balance at end of period
1,455,327

 
$
19.88

 
1,455,327

 
$
19.88