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Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Oct. 03, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets:        
Held-to-maturity Securities, Transferred Security, at Carrying Value $ 0      
Held-to-maturity Securities, Unrecognized Holding Gain 0      
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities 0      
Liabilities:        
Embedded derivative (1,316)   $ (1,105)  
Long-term Debt, Fair Value 756,900   853,500  
Long-term Debt 448,080   453,817  
Derivative, Notional Amount $ 29,000   48,000  
Derivative, Description of Terms The Company enters into forward contracts with a highly-rated financial institution to mitigate the foreign currency risk associated with intercompany loans denominated in a currency other than the legal entity's functional currency. The notional amount of the forward contracts was $29,000 as of December 31, 2015. The forward contracts settle monthly and are expected to be renewed at the Company's discretion on a monthly basis until the intercompany loans are repaid. The forward contracts were renewed on the last day of the fourth fiscal quarter. We have not designated the forward contracts as hedges for accounting purposes, and as such the change in the fair value of the contract is recognized in the consolidated condensed statements of operations as a component of other income (expense).      
Fair Value, Measurements, Recurring [Member]        
Assets:        
Assets held in rabbi trusts $ 39,849   40,270  
Available for sale securities 3,604   15,432  
Fair Value Assets 352,808   378,502  
Liabilities:        
Fair Value Liabilities (1,316)   (1,105)  
U.S. Plans [Member]        
Assets:        
Fair value of plan assets 258,092   273,644 $ 295,633
U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets     26,601  
U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 255,804   244,037  
U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 2,288   3,006  
Non-U.S. Plans [Member]        
Assets:        
Fair value of plan assets 51,263   49,156 $ 48,859
Non-U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 9,302   9,268  
Non-U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 13,416   18,269  
Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 28,545   21,619  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Assets held in rabbi trusts 25,906   26,853  
Available for sale securities 3,604   4,439  
Fair Value Assets 337,616   352,804  
Liabilities:        
Fair Value Liabilities 0   0  
Fair Value, Inputs, Level 1 [Member] | U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets     26,601  
Fair Value, Inputs, Level 1 [Member] | U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 254,555   242,749  
Fair Value, Inputs, Level 1 [Member] | U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 2,288   3,006  
Fair Value, Inputs, Level 1 [Member] | Non-U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 9,302   9,268  
Fair Value, Inputs, Level 1 [Member] | Non-U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 13,416   18,269  
Fair Value, Inputs, Level 1 [Member] | Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 28,545   21,619  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Assets held in rabbi trusts 13,943   13,417  
Available for sale securities 0   10,993  
Fair Value Assets 15,192   25,698  
Liabilities:        
Fair Value Liabilities 0   0  
Fair Value, Inputs, Level 2 [Member] | U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets     0  
Fair Value, Inputs, Level 2 [Member] | U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 1,249   1,288  
Fair Value, Inputs, Level 2 [Member] | U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 2 [Member] | Non-U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 2 [Member] | Non-U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 2 [Member] | Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Assets held in rabbi trusts 0   0  
Available for sale securities 0   0  
Fair Value Assets 0   0  
Liabilities:        
Fair Value Liabilities (1,316)   (1,105)  
Fair Value, Inputs, Level 3 [Member] | U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets     0  
Fair Value, Inputs, Level 3 [Member] | U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 3 [Member] | U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 3 [Member] | Non-U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 3 [Member] | Non-U.S. Plans [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Fair Value, Inputs, Level 3 [Member] | Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Fair value of plan assets 0   0  
Convertible Senior Debentures, Due 2040 [Member]        
Liabilities:        
Embedded derivative $ (576)   (526)  
Convertible debentures issuance date Nov. 09, 2010      
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative $ (576)   (526)  
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative 0   0  
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative 0   0  
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative (576)   (526)  
Convertible Senior Debentures, Due 2041 [Member]        
Liabilities:        
Embedded derivative $ (438)   (341)  
Convertible debentures issuance date May 13, 2011      
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative $ (438)   (341)  
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative 0   0  
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative 0   0  
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative $ (438)   (341)  
Convertible Senior Debentures 2042 [Member]        
Liabilities:        
Convertible debentures issuance date May 31, 2012      
Convertible Senior Debentures 2042 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative $ (302)   (238)  
Convertible Senior Debentures 2042 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative 0   0  
Convertible Senior Debentures 2042 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative 0   0  
Convertible Senior Debentures 2042 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities:        
Embedded derivative $ (302)   $ (238)  
Capella Microsystems (Taiwan) Inc. [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets:        
Long-lived assets held and used   $ 10,900    
Capacitors Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets:        
Goodwill, Fair Value Disclosure   $ 0