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Stock-Based Compensation Plans and Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of iPip Activity
 
Three Months Ended March 31, 2018
 
Year Ended December 31, 2017
 
iPIP Investment Pool
 
iPIP Investment Pool
 
2013-2014
 
2015-2016
 
2017-2018
 
2013-2014
 
2015-2016
 
2017-2018
Points at beginning of period
86.57

 
84.16

 
40.97

 
92.00

 
74.10

 
0

Granted
0.50

 
0

 
49.08

 
5.00

 
17.88

 
41.68

Forfeited
(0.15
)
 
(0.89
)
 
(4.56
)
 
(10.43
)
 
(7.82
)
 
(0.71
)
Points at end of period
86.92

 
83.27

 
85.49

 
86.57

 
84.16

 
40.97
Schedule of Restricted Stock Units Activity
 
Three Months Ended
March 31, 2018
 
Year Ended
December 31, 2017
Nonvested at beginning of period
282

 
290

Granted
264

 
116

Vested
(20
)
 
(75
)
Forfeited
(40
)
 
(49
)
Nonvested at end of period
486

 
282