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Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Changes in provisions for contingencies
Changes in provisions during the presented periods are summarized below:
 
Provision for employee- related litigation

Provision for tax- related litigation

Other provisions

Total

 
(in thousands)
Balance at January 1, 2015
$
781

$
592

$
—

$
1,373

Charges
200

44

388

632

Provision used
(487
)
—

—

(487
)
Provision released not used
(186
)
(541
)
—

(727
)
Currency translation adjustments
(72
)
(51
)
—

(123
)
Balance at January 1, 2016
$
236

$
44

$
388

$
668

Charges
671

—

166

837

Provision used
(402
)
—

(48
)
(450
)
Provision released not used
—

(44
)
(347
)
(391
)
Currency translation adjustments
(20
)
—

10

(10
)
Balance at December 31, 2016
$
485

$
—

$
169

$
654

 - of which current
$
485

$
—

$
169

$
654