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Risk Management and Derivatives (Details 2)
3 Months Ended
Mar. 31, 2013
Foreign currency derivatives
USD ($)
Dec. 31, 2012
Foreign currency derivatives
USD ($)
Mar. 31, 2013
Sells EUR/Buys USD Forward
USD ($)
Mar. 31, 2013
Sells EUR/Buys USD Forward
EUR (€)
Mar. 31, 2013
Sells GBP/Buys USD Forward
USD ($)
Mar. 31, 2013
Sells GBP/Buys USD Forward
GBP (£)
Mar. 31, 2013
Sells CAD/Buys USD Forward
USD ($)
Mar. 31, 2013
Sells CAD/Buys USD Forward
CAD
Mar. 31, 2013
Interest rate swap
USD ($)
Derivatives                  
Notional Amount     $ 108,222,000 € 84,400,000 $ 42,396,000 £ 27,900,000 $ 47,866,000 48,700,000 $ 28,000,000
Maturity     Apr. 03, 2013 Apr. 03, 2013 Apr. 03, 2013 Apr. 03, 2013 Apr. 03, 2013 Apr. 03, 2013 Nov. 01, 2019
Variable Rate                 2.00%
Fixed Rate                 3.75%
Expense related to qualifying cash flow hedges expected to be reclassified to earnings over the next 12 months                 900,000
Income related to previously terminated cash flow hedges expected to be reclassified to earnings over the next 12 months                 600,000
Foreign currency derivative collateral included in restricted cash $ 9,600,000 $ 9,600,000