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Fair Value of Financial Instruments - Derivatives (Details)
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3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
USD ($)
derivative
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Sep. 30, 2012
USD ($)
|
Sep. 30, 2013
USD ($)
derivative
|
Sep. 30, 2012
USD ($)
|
Dec. 31, 2012
USD ($)
derivative
|
Sep. 30, 2013
Forward Contracts
EUR (€)
|
Sep. 30, 2013
Forward Contracts
GBP (£)
|
Dec. 31, 2012
Forward Contracts
EUR (€)
|
|
| Derivatives, Fair Value [Line Items] | ||||||||
| Derivative, number of instruments held | 2 | 2 | 1 | |||||
| Derivative, notional amount | € 4,200,000 | £ 1,900,000 | € 10,700,000 | |||||
| Foreign currency contract, asset, fair value disclosure | 0 | 0 | 0 | |||||
| Derivative instruments not designated as hedging instruments, loss | 400,000 | 400,000 | 600,000 | 100,000 | ||||
| Foreign currency transaction gain, before tax | $ 300,000 | $ 400,000 | $ 100,000 | $ 49,000 | ||||