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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts and Reserves
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
(IN THOUSANDS)
 
 
For the Year Ended December 31, 2017
 
Balance at
beginning
of period
 
Additions charged to costs and expenses
 
Accounts
written off
 
Translation
adjustments
 
Balance at end of period
Allowance for doubtful accounts
$
9,995

 
$
3,798

 
$
(1,496
)
 
$
1,095

 
$
13,392

Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets
152,752

 
35,646

(1) 
—

 
19,085

 
207,483

 
 
 
 
 
 
 
 
 
 
 
For the Year Ended December 31, 2016
 
Balance at
beginning
of period
 
Additions (deductions) charged to costs and expenses
 
Accounts
written off
 
Translation
adjustments
 
Balance at
end of
period
Allowance for doubtful accounts
$
8,229

 
$
2,452

 
$
(225
)
 
$
(461
)
 
$
9,995

Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets
339,395

 
(171,408
)
(2)(4) 
—

 
(15,235
)
 
152,752

 
 
 
 
 
 
 
 
 
 
 
For the Year Ended December 31, 2015
 
Balance at
beginning
of period
 
Additions charged to costs and expenses
 
Accounts
written off
 
Translation
adjustments
 
Balance at
end of
period
Allowance for doubtful accounts
$
9,147

 
$
590

 
$
60

 
$
(1,568
)
 
$
8,229

Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets
355,568

 
16,445

(3) 
—

 
(32,618
)
 
339,395

_______________________ 
(1)
The 2017 amount includes an adjustment to the 2016 foreign net operating loss carryforwards in the amount of $58.8 million, as discussed in Note 10 of the Consolidated Financial Statements.
(2)
The 2016 amount includes an adjustment to the 2015 foreign net operating loss carryforwards in the amount of $7.6 million, as discussed in Note 10 of the Consolidated Financial Statements.
(3)
The 2015 amount includes an adjustment to the 2014 foreign net operating loss carryforwards in the amount of $10.0 million, as discussed in Note 10 of the Consolidated Financial Statements.
(4)
The Company executed a legal entity restructuring that resulted in a significant reduction of fully valued deferred tax assets.