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Stock-based compensation (Tables)
6 Months Ended
Jun. 30, 2014
Share-based Compensation [Abstract]  
Rollforward of unvested stock-based compensation awards
A summary of our restricted stock activity during the six months ended June 30, 2014 is presented below:
 
Time Vested
 
Performance Vested
 
Weighted
average
grant date
fair value
 
Restricted
shares
 
Vest
date
fair
value
 
Weighted
average
grant date
fair value
 
Restricted
shares
 
($ per share)
 
 
 
 
 
($ per share)
 
 
Unvested and outstanding at January 1, 2014
$
634.67

 
19,246

 
 
 
$
307.45

 
46,701

Granted
818.50

 
1,615

 
 
 
204.90

 
2,998

Vested
649.20

 
(4,414
)
 
$
3,613

 

 

Forfeited
641.10

 
(177
)
 
 
 
307.00

 
(484
)
Unvested and total outstanding at June 30, 2014
$
648.91

 
16,270

 
 
 
$
301.20

 
49,215

A summary of our phantom stock and RSU activity during the six months ended June 30, 2014 is presented in the following table: 
 
Phantom Plan
 
RSU Plan
 
 
 
Weighted
average
grant date
fair value
 
Phantom
shares
 
Vest
date
fair
value
 
Weighted
average
grant date
fair value
 
Restricted Stock Units
 
Vest
date
fair
value
 
($ per share)
 
 
 
 
 
($ per share)
 
 
 
 
Unvested and outstanding at January 1, 2014
$
17.01

 
53,162

 
 
 
$
13.53

 
325,297

 
 
Granted

 

 
 
 
8.11

 
475,878

 
 
Vested
10.91

 
(17,430
)
 
$
141

 
14.52

 
(99,754
)
 
$
809

Forfeited
19.16

 
(4,588
)
 
 
 
10.01

 
(58,197
)
 
 
Unvested and outstanding at June 30, 2014
$
20.10

 
31,144

 
 
 
$
9.68

 
643,224

 
 
Stock-based compensation cost
We recognized stock-based compensation expense as follows for the periods indicated:
 
Three months ended
 
Six months ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
Stock-based compensation cost
$
4,186

 
$
682

 
$
6,717

 
$
2,575

Less: stock-based compensation cost capitalized
(1,484
)
 
(356
)
 
(2,446
)
 
(935
)
Stock-based compensation expense
$
2,702

 
$
326

 
$
4,271

 
$
1,640