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Performance Awards (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Grant Activity
The following table summarizes the grant activity for the years December 31, 2017, 2016 and 2015:
Grant Date
 
Grant Amount
 
Adjustments
 
Forfeitures
 
Payments
 
Adjusted Award Value at December 31, 2017
 
Vesting Schedule
 
Remaining Periods (in Months) to Vesting
November 2014
 
$
2,087

 
(495
)
 
$
(1,097
)
 
$
(495
)
 
$
—

 
 November 2017
 
0
November 2015
 
1,487

 
646

 
(197
)
 
$
—

 
1,936

 
 November 2018
 
10
November 2016
 
1,434

 
(454
)
 
(37
)
 
—

 
943

 
November 2019
 
22
November 2017
 
1,584

 
(755
)
 
—

 
—

 
829

 
November 2020
 
34
 
 
$
6,592

 
$
(1,058
)
 
$
(1,331
)
 
$
(495
)
 
$
3,708