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Stock-Based Compensation Plans and Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of performance incentive plans
The following is a summary of the status of the Company’s liability-classified iPIP plans and changes during the three months ended March 31, 2019 and the year ended December 31, 2018.
 
Three Months Ended March 31, 2019
 
Year Ended December 31, 2018
 
iPIP Investment Pool
 
iPIP Investment Pool
 
2013-2014
 
2015-2016
 
2017-2018
 
2013-2014
 
2015-2016
 
2017-2018
Points at beginning of period
85.77

 
79.41

 
82.43

 
86.57

 
84.16

 
40.97

Granted
—

 
—

 
—

 
0.50

 
—

 
49.33

Forfeited
—

 
(0.82
)
 
(1.03
)
 
(1.3
)
 
(4.75
)
 
(7.87
)
Points at end of period
85.77

 
78.59

 
81.40

 
85.77

 
79.41

 
82.43
Schedule of restricted stock units activity
A summary of the Company’s stock-based compensation awards to certain employees in the form of long-term incentive awards for the three months ended March 31, 2019 and the year ended December 31, 2018, are as follows (in thousands):
 
Three Months Ended March 31, 2019
 
Year Ended
December 31, 2018
Nonvested at beginning of period
357

 
282

Granted
474

 
278

Vested
(52
)
 
(142
)
Forfeited
(9
)
 
(61
)
Nonvested at end of period
770

 
357