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Risk Management and Derivatives (Details 2)
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Foreign currency derivatives
USD ($)
Dec. 31, 2012
Foreign currency derivatives
USD ($)
Jun. 30, 2013
Sells INR Buys USD Forward
USD ($)
Jun. 30, 2013
Sells INR Buys USD Forward
RSD
Jun. 30, 2013
Sells EUR/Buys USD Forward
USD ($)
Jun. 30, 2013
Sells EUR/Buys USD Forward
EUR (€)
Jun. 30, 2013
Sells GBP/Buys USD Forward
USD ($)
Jun. 30, 2013
Sells GBP/Buys USD Forward
GBP (£)
Jun. 30, 2013
Sells CAD/Buys USD Forward
USD ($)
Jun. 30, 2013
Sells CAD/Buys USD Forward
CAD
Jun. 30, 2013
Interest rate swap
USD ($)
Jun. 30, 2013
Interest rate swap
USD ($)
Jun. 30, 2013
Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Jun. 30, 2013
Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Foreign exchange contracts
Other Expense
USD ($)
Derivative [Line Items]                                        
Notional Amount     $ 7,642,000 456,000,000 $ 109,831,000 € 84,400,000 $ 42,421,000 £ 27,900,000 $ 41,042,000 43,150,000 $ 28,000,000 $ 28,000,000                
Maturity     Jan. 01, 2014 Jan. 01, 2014 Jul. 03, 2013 Jul. 03, 2013 Jul. 03, 2013 Jul. 03, 2013 Jul. 03, 2013 Jul. 03, 2013 Nov. 01, 2019                  
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion)                         344,000 0 344,000 0        
Amount of Gain or (Loss) Recognized in Income                                 (414,000) 10,191,000 9,742,000 1,332,000
Variable Rate                     2.00% 2.00%                
Fixed Rate                     3.75% 3.75%                
Expense related to qualifying cash flow hedges expected to be reclassified to earnings over the next 12 months                       800,000                
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 $ 11,200,000 $ 9,600,000