Acquisition (Assets and Liabilities Acquired) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Jan. 22, 2015
Assets:      
Goodwill $ 175,009 $ 98,227  
Arlon [Member]      
Assets:      
Cash     142
Accounts receivable     17,301
Other current assets     856
Inventory     10,029
Deferred income tax assets, current     1,035
Property, plant & equipment     30,807
Intangible assets     50,020
Goodwill     85,379
Total assets     195,569
Liabilities:      
Accounts payable     4,958
Other current liabilities     4,249
Deferred tax liability     23,706
Other long-term liabilities     4,555
Total liabilities     37,468
Fair value of net assets acquired     $ 158,101