Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (Narrative) (Details)

v2.4.0.6
Derivative Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative Financial Instruments [Abstract]      
Maximum net exposure to counterparty $ 238    
Cash flow hedge gain (loss) reclassified to revenue 394 (346)  
Accumulated derivative instrument gain (loss) 169 506  
Adjustment to accumulated other comprehensive income $ (675) $ 743 $ (237)