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Financial Instruments Foreign Exchange Summary (Details) (Not Designated as Hedging Instrument, Foreign Exchange Contract)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2014
Japanese Yen
USD ($)
Mar. 31, 2014
Japanese Yen
JPY (¥)
Dec. 31, 2013
Japanese Yen
USD ($)
Dec. 31, 2013
Japanese Yen
JPY (¥)
Mar. 31, 2014
Pound Sterling
USD ($)
Mar. 31, 2014
Pound Sterling
GBP (£)
Dec. 31, 2013
Pound Sterling
USD ($)
Dec. 31, 2013
Pound Sterling
GBP (£)
Derivative [Line Items]                        
Carrying Amount $ 25,285,000 [1] $ 25,090,000 $ 23,150,000 [1] $ 24,742,000 $ 1,403,000   $ 1,374,000   $ 23,882,000   $ 23,716,000  
Notional Amount           ¥ 144,830,000   ¥ 144,717,000   £ 14,332,000   £ 14,311,000
[1] The financial instruments payable in foreign currencies are entered into with a counterparty and are considered Level 2 measurements. Carrying value approximates fair value.