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Accrued Liabilities (Tables)
6 Months Ended
Jun. 30, 2019
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities consisted of the following:
(in thousands)
June 30, 2019
 
December 31, 2018
Accrued salaries and other compensation
$
3,157

 
$
12,379

Insurance
2,930

 
5,464

Deferred revenues (contract liabilities)
730

 
1,374

Property and other taxes
3,224

 
3,829

Intangible liability

 
1,079

Interest
3,370

 
3,318

Operating lease liability - current
421

 

Other
2,225

 
1,776

 
$
16,057

 
$
29,219