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Derivative instruments (Details)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
Cross-currency swap
USD ($)
Jun. 30, 2011
Cross-currency swap
USD ($)
Jun. 30, 2012
Cross-currency swap
USD ($)
Jun. 30, 2011
Cross-currency swap
USD ($)
Dec. 31, 2011
Cross-currency swap
USD ($)
Sep. 30, 2010
Terminated hedges
Cross-currency swap
USD ($)
Dec. 31, 2006
Terminated hedges
Cross-currency swap
USD ($)
Sep. 30, 2010
Cash flow hedges
Cross-currency swap
Pay Euros
EUR (€)
Sep. 30, 2010
Cash flow hedges
Cross-currency swap
Receive U.S. dollars
USD ($)
Fair value of derivatives                          
Derivative assets         $ 2,321,000   $ 2,321,000   $ 1,011,000        
Unrealized gain (loss) recorded in other comprehensive income (loss), net of taxes (585,000) 199,000 (76,000) 1,301,000 (585,000) 199,000 (76,000) 1,301,000          
Amortization term of instrument (in years)                     10 years    
Fixed rate (as a percent)                       5.00% 4.635%
Notional amount                     63,000,000 33,500,000 45,500,000
Cash settlement amount                   $ 450,000