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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
Changes in goodwill during the three months ended March 31, 2016 are as follows:
(In thousands)
Goodwill
Balance at January 1, 2016
$
340,338

Disposal
(198
)
Currency translation
(205
)
Balance at March 31, 2016
$
339,935
Changes in Intangible Assets, Net of Accumulated Amortization
Changes in intangible assets, net of accumulated amortization during the three months ended March 31, 2016 are as follows:
(In thousands)
Intangible Assets
Net balance at January 1, 2016
$
90,068

Amortization expense
(1,973
)
Currency translation
(1,403
)
Net balance at March 31, 2016
$
86,692