Fair Value Measurements - Company's financial assets and financial liabilities that are measured and recognized at fair value on a recurring basis, classified under the appropriate level of fair value hierarchy (Details) (Fair value measurements, recurring, Derivative financial instruments, liabilities, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Liability for foreign currency derivative financial instruments (including forward contracts)	$ 1
Asset for foreign currency derivative financial instruments (including forward contracts)		16
Quoted Prices in Active Markets for Identical Items (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Liability for foreign currency derivative financial instruments (including forward contracts)
Asset for foreign currency derivative financial instruments (including forward contracts)
Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Liability for foreign currency derivative financial instruments (including forward contracts)	1
Asset for foreign currency derivative financial instruments (including forward contracts)		16
Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Liability for foreign currency derivative financial instruments (including forward contracts)
Asset for foreign currency derivative financial instruments (including forward contracts)