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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Compensation cost
The following table summarizes the compensation expense for PSUs (in thousands):
 
 
Year Ended December 31,
Line Item
 
2019
 
2018
 
2017
Advisory services fee
 
$
2,439

 
$
2,443

 
$
(1,375
)
The following table summarizes the stock-based compensation expense for restricted stock units (in thousands):
 
 
Year Ended December 31,
Line Item
 
2019
 
2018
 
2017
Advisory services fee
 
$
2,468

 
$
2,277

 
$
916

Management fees
 
155


219


92

Corporate general and administrative - Premier
 
72

 
—

 
—

Corporate general and administrative - independent directors
 
208

 
243

 
201

 
 
$
2,903

 
$
2,739

 
$
1,209
Summary of restricted stock activity
A summary of our restricted stock activity is as follows (shares in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
Number of Units
 
Weighted Average
Price at Grant
 
Number of Units
 
Weighted Average
Price at Grant
 
Number of Units
 
Weighted Average
Price at Grant
Outstanding at beginning of year
441

 
$
10.91

 
420

 
$
11.87

 
360

 
$
12.90

Restricted shares granted
261

 
12.68

 
257

 
9.90

 
198

 
10.78

Restricted shares vested
(198
)
 
10.75

 
(229
)
 
11.54

 
(131
)
 
13.05

Restricted shares canceled
(7
)
 
11.59

 
(7
)
 
10.50

 
(7
)
 
11.81

Outstanding at end of year
497

 
$
11.89

 
441

 
$
10.91

 
420

 
$
11.87
Summary of PSUs activity
A summary of our PSU activity is as follows (shares in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
Number of Units
 
Weighted Average Price at Grant
 
Number of Units
 
Weighted Average Price at Grant
 
Number of Units
 
Weighted Average Price at Grant
Outstanding at beginning of year
316

 
$
12.29

 
381

 
$
11.97

 
417

 
$
14.80

PSUs granted
223

 
19.96

 
197

 
13.43

 
119

 
10.42

PSUs canceled
(119
)
 
10.42

 
(262
)
 
12.67

 
(155
)
 
18.40

Outstanding at end of year
420

 
$
16.91

 
316

 
$
12.29

 
381

 
$
11.97