Derivative Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Designated as Hedging Instrument
Effect of derivative instruments on the Consolidated Balance Sheets and Consolidated Statements of Operations
Net gain (loss) recognized in accumulated other comprehensive income (loss) (effective portion)		$ (89)
Designated as Hedging Instrument | Other Expense
Effect of derivative instruments on the Consolidated Balance Sheets and Consolidated Statements of Operations
Net gain (loss) reclassified from accumulated other comprehensive income to net income (loss) (effective portion)		(150)
Not Designated as Hedging Instrument | Other Expense
Effect of derivative instruments on the Consolidated Balance Sheets and Consolidated Statements of Operations
Net gain (loss) recognized in net income (loss)	$ (62)	$ (450)