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Long-Term Incentive Plan (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Equity-Based Incentive Compensation Expense
Our equity-based incentive compensation expense was as follows (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2017
 
2018
 
2017
 
2018
Performance-based awards
 
$
5,910

 
$
9,165

 
$
9,391

 
$
15,089

Time-based awards
 
660

 
882

 
1,326

 
1,590

Total
 
$
6,570

 
$
10,047

 
$
10,717

 
$
16,679

 
 
 
 
 
 
 
 
 
Allocation of LTIP expense on our consolidated statements of income:
 
 
 
 
 
 
 
 
G&A expense
 
$
6,514

 
$
9,968

 
$
10,632

 
$
16,545

Operating expense
 
56

 
79

 
85

 
134

Total
 
$
6,570

 
$
10,047

 
$
10,717

 
$
16,679