Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Narrative) (Details)

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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative Financial Instruments [Abstract]          
Maximum net exposure to counterparty     $ 3,839    
Cash flow hedge gain (loss) reclassified to revenue $ 1,058 $ (287) 2,764 $ (621)  
Accumulated derivative instrument gain (2,002)   (2,002)   $ (1,891)
Adjustment to accumulated other comprehensive income $ (1,142) $ 74 $ 111 $ 132