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Performance Awards (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014 (in thousands, except for the remaining periods):
Grant Date
 
Grant Amount
 
Forfeitures/Adjustments
 
Payments
 
Balance at December 31, 2016
 
Vesting Schedule
 
Unrecognized Compensation
 
Remaining Periods (in Months) to Vesting
November 2013
 
$
1,351

 
$
(1,033
)
 
$
(318
)
 
$
—

 
November 2016
 
$
—

 
0
November 2014
 
$
2,087

 
$
(1,062
)
 
$
—

 
$
1,025

 
 November 2017
 
$
256

 
9
November 2015
 
1,487

 
(160
)
 
—

 
1,327

 
 November 2018
 
774

 
21
November 2016
 
1,434

 
—

 
—

 
1,434

 
November 2019
 
1,315

 
33
 
 
$
6,359

 
$
(2,255
)
 
$
(318
)
 
$
3,786

 
 
 
$
2,345