Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (Narrative) (Details)

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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Financial Instruments [Abstract]      
Remaining maturity of derivative contracts   1 year 6 months  
Maximum net exposure to counterparty $ 964    
Cash flow hedge gain (loss) reclassified to revenue 804 394  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 611 169  
Adjustment to accumulated other comprehensive income $ (442) $ (675) $ 743