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Risk Management and Derivatives (Details 5)
12 Months Ended
Dec. 31, 2012
Foreign currency derivatives
USD ($)
Dec. 31, 2011
Foreign currency derivatives
USD ($)
Dec. 31, 2012
Sells EUR/Buys USD Forward
USD ($)
Dec. 31, 2012
Sells EUR/Buys USD Forward
EUR (€)
Dec. 31, 2012
Sells GBP/Buys USD Forward
USD ($)
Dec. 31, 2012
Sells GBP/Buys USD Forward
GBP (£)
Dec. 31, 2012
Sells CAD/Buys USD Forward
USD ($)
Dec. 31, 2012
Sells CAD/Buys USD Forward
CAD
Dec. 31, 2012
Interest rate swap
USD ($)
Derivatives                  
Notional Amount     $ 143,925,000 € 109,000,000 $ 85,856,000 £ 52,850,000 $ 51,065,000 50,700,000 $ 28,000,000
Maturity     Jan. 03, 2013 Jan. 03, 2013 Jan. 03, 2013 Jan. 03, 2013 Jan. 03, 2013 Jan. 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                 3,200,000
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