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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
Changes in goodwill during the six months ended June 30, 2018 are as follows:
(In thousands)
Goodwill
Balance at January 1, 2018
$
422,185

Disposals
(525
)
Currency translation
(3,276
)
Balance at June 30, 2018
$
418,384
Changes in Intangible Assets, Net of Accumulated Amortization
Changes in intangible assets, net of accumulated amortization during the six months ended June 30, 2018, are as follows:
(In thousands)
Intangible Assets
Net balance at January 1, 2018
$
183,088

Amortization expense
(5,307
)
Currency translation
(1,181
)
Net balance at June 30, 2018
$
176,600