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Deferred compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Compensation [Abstract]  
Summary of amounts related to cash LTIP
A summary of compensation expense for our cash awards is presented below:
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Cash LTIP expense (net of amounts capitalized)
 
$
(11
)
 
$
185

 
$
147

 
$
473

Cash LTIP awarded
 
775

 
127

 
775

 
174

Cash LTIP payments
 
955

 
1,166

 
955

 
1,183
Rollforward of unvested deferred compensation
A summary of our RSU activity is presented below:

 
 
Equity classified RSUs
 
 
Service-condition RSUs
 
 
 
Market condition RSUs
 
 
Weighted average
award date fair value
 
Restricted
units
 
Vest date
fair value
 
Weighted average
award date
fair value
 
Restricted
units
 
 
($ per share)
 
 
 
 
 
($ per share)
 
 
Unvested and outstanding at January 1, 2019
 
$
17.66

 
89,633

 
 
 
$
—

 
—

Granted
 
$
1.33

 
788,323

 
 
 
$
1.36

 
565,000

Vested
 
$
17.66

 
(25,099
)
 
$
33

 
$
—

 
—

Forfeited
 
$
17.66

 
(14,305
)
 
 
 
$
—

 
—

Unvested and outstanding at September 30, 2019
 
$
2.31

 
838,552

 
 
 
$
1.36

 
565,000

 
 
Liability classified RSUs (1)
 
 
Weighted average
award date fair value
 
Restricted
units
 
Vest date
fair value
 
 
($ per share)
 
 
 
 
Unvested and outstanding at January 1, 2019
 
$
17.66

 
37,196

 
 
Granted
 
$
1.44

 
71,570

 
 
Vested
 
$
17.09

 
(10,302
)
 
$
14

Forfeited
 
$
17.66

 
(7,836
)
 
 
Unvested and outstanding at September 30, 2019
 
$
4.92

 
90,628

 
 
A summary of our restricted stock activity pursuant to our MIP is presented below:
 
 
Time Shares
 
Performance Shares
 
 
Weighted
average
award date
fair value
 
Restricted
shares
 
Vest
date
fair
value
 
Weighted
average
award date
fair value
 
Restricted
shares
 
 
($ per share)
 
 
 
 
 
($ per share)
 
 
Unvested and outstanding at January 1, 2019
 
$
20.06

 
818,206

 
 
 
$
20.12

 
125,528

Granted
 
$
6.94

 
198,378

 
 
 
$
6.74

 
55,000

Vested
 
$
20.00

 
(393,178
)
 
$
2,319

 
$
—

 
—

Forfeited
 
$
20.05

 
(95,684
)
 
 
 
$
20.05

 
(28,098
)
Unvested and outstanding at September 30, 2019
 
$
15.17

 
527,722

 
 
 
$
15.30

 
152,430
Schedule of valuation of awards
The fair value and associated assumptions, which are considered to be Level 3 inputs within the fair value hierarchy, for each RSA or RSU granted in 2019 with a market condition is as follows:

 
 
Grant Date of Market Condition Award
 
 
August 30, 2019
 
April 22, 2019
 
March 11, 2019
Grant date fair value
 
$
1.41

 
$
8.59

 
$
4.66

Risk free rate
 
1.75
%
 
2.52
%
 
2.52
%
Volatility
 
90.0
%
 
64.1
%
 
64.1
%
Stock-based compensation cost
Stock-based compensation expense is as follows for the periods indicated:
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Stock-based compensation cost
 
$
883

 
$
3,112

 
$
3,603

 
$
11,027

Less: stock-based compensation cost capitalized
 
(222
)
 
(807
)
 
(1,247
)
 
(2,428
)
Stock-based compensation expense
 
$
661

 
$
2,305

 
$
2,356

 
$
8,599

Number of vested shares repurchased or settled in cash
 
17,889

 
—

 
224,542

 
256,895

Payments for stock-based compensation
 
24

 
—

 
1,195

 
4,872