Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts

v3.8.0.1
Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts

Classifications
 
Balance at
beginning
of year
 
Charged to
cost and
expenses
 
Charged
to other
accounts
 
Deductions
 
Balance at 
end of
year
Dollars in Thousands
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2017
 
 
 
 
 
 
 
 
 
 
Allowance for bad debt
 
$
8,259

 
$
444

 
$
(414
)
 
$
(725
)
 
$
7,564

Allowance for obsolete rig materials and supplies
 
$
1,166

 
65

 
—

 
(422
)
 
809

Deferred tax valuation allowance
 
$
171,133

 
$
(14,625
)
 
$
1,406

 
$
—

 
$
157,914

Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
 
Allowance for bad debt
 
$
8,694

 
$
1,483

 
$
4

 
$
(1,922
)
 
$
8,259

Allowance for obsolete rig materials and supplies
 
$
626

 
978

 
$
(3
)
 
$
(435
)
 
$
1,166

Deferred tax valuation allowance
 
$
51,105

 
$
117,707

 
$
2,321

 
$
—

 
$
171,133

Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
 
Allowance for bad debt
 
$
11,188

 
$
341

 
$
(825
)
 
$
(2,010
)
 
$
8,694

Allowance for obsolete rig materials and supplies
 
$
530

 
$
—

 
$
236

 
$
(140
)
 
$
626

Deferred tax valuation allowance
 
$
9,922

 
$
40,676

 
$
507

 
$
—

 
$
51,105