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Financial Instruments - Derivatives (Details)
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2012
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2013
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2013
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
CHF
Dec. 31, 2013
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
Other Liabilities [Member]
USD ($)
Dec. 31, 2012
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
Other Liabilities [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Forward [Member]
Designated as Hedging Instrument [Member]
Prepaid and Other Current Assets [Member]
USD ($)
Dec. 31, 2012
Foreign Exchange Forward [Member]
Designated as Hedging Instrument [Member]
Prepaid and Other Current Assets [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Forward [Member]
Designated as Hedging Instrument [Member]
Other Accrued Expenses [Member]
USD ($)
Dec. 31, 2012
Foreign Exchange Forward [Member]
Designated as Hedging Instrument [Member]
Other Accrued Expenses [Member]
USD ($)
Dec. 31, 2013
Note due 2020 [Member]
EUR (€)
Dec. 31, 2013
Note due 2020 [Member]
Designated as Hedging Instrument [Member]
EUR (€)
Derivatives, Fair Value [Line Items]                            
Notional amount of derivatives   $ 33,216,000 $ 9,090,000 $ 104,688,000 $ 50,000,000 65,100,000                
Fair Value - Asset                 879,000 85,000        
Fair Value - Liability             (23,716,000) (22,681,000)     (168,000) (799,000)    
Face amount of notes                         300,000,000 300,000,000
Gain (loss) on euro net investment hedge, gross 6,099,000                          
Gain (loss) on euro net investment hedge, net of tax $ 3,964,000