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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
CTS CORPORATION
(in thousands)
Balance at
Beginning
of Period
Charged to Expense
Charged
to Other
Accounts
(Write-offs) / Recoveries
Balance
at End
of Period
Year ended December 31, 2017
Allowance for doubtful accounts
$
170

$
248

$
9

$
(70
)
$
357

Year ended December 31, 2016
Allowance for doubtful accounts
$
133

$
44

$
—

$
(7
)
$
170

Year ended December 31, 2015
Allowance for doubtful accounts
$
100

$
33

$
—

$
—

$
133