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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Derivative Financial Instruments [Abstract]          
Maximum net exposure to company     $ 1,044    
Cash flow hedge gain (loss) reclassified to revenue 324 120 495 121  
Accumulated derivative instrument gain (loss) 521   521   (169)
Adjustment to accumulated other comprehensive income $ (91) $ 379 $ 690 $ (159)