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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Activity
A summary of our restricted stock activity is as follows (shares in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
Restricted Shares
 
Weighted Average
Price at Grant
 
Restricted Shares
 
Weighted Average
Price at Grant
 
Restricted Shares
 
Weighted Average
Price at Grant
Outstanding at beginning of year
420

 
$
11.87

 
360

 
$
12.90

 
140

 
$
16.01

Restricted shares granted
257

 
9.90

 
198

 
10.78

 
309

 
12.34

Restricted shares vested
(229
)
 
11.54

 
(131
)
 
13.05

 
(84
)
 
15.98

Restricted shares canceled
(7
)
 
10.50

 
(7
)
 
11.81

 
(5
)
 
13.82

Outstanding at end of year
441

 
$
10.91

 
420

 
$
11.87

 
360

 
$
12.90
Compensation cost
The following table summarizes the stock-based compensation expense for restricted stock units (in thousands):
 
 
Year Ended December 31,
Line Item
 
2018
 
2017
 
2016
Advisory services fee
 
$
2,277

 
$
916

 
$
597

Management fees
 
219

 
92

 
71

Corporate general and administrative
 
243

 
201

 
227

 
 
$
2,739

 
$
1,209

 
$
895

The following table summarizes the compensation expense for PSUs (in thousands):
 
 
Year Ended December 31,
Line Item
 
2018
 
2017
 
2016
Advisory services fee
 
$
2,443

 
$
(1,375
)
 
$
813
Summary of PSUs Activity
A summary of our PSU activity is as follows (shares in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
PSUs
 
Weighted Average Price at Grant
 
PSUs
 
Weighted Average Price at Grant
 
PSUs
 
Weighted Average Price at Grant
Outstanding at beginning of year
381

 
$
11.97

 
417

 
$
14.80

 
155

 
$
18.40

PSUs granted
197

 
13.43

 
119

 
10.42

 
262

 
12.67

PSUs canceled
(262
)
 
12.67

 
(155
)
 
18.40

 
—

 
—

Outstanding at end of year
316

 
$
12.29

 
381

 
$
11.97

 
417

 
$
14.80