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Derivative Financial Instruments Foreign Currency Exchange Rate Risk (Details)
 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
May 23, 2014
Cross-currency swap agreements [Member]
USD ($)
May 23, 2014
Cross-currency swap agreements [Member]
AUD
Dec. 03, 2012
Cross-currency swap agreements [Member]
USD ($)
Dec. 03, 2012
Cross-currency swap agreements [Member]
AUD
Sep. 30, 2014
Foreign Subsidiary Third Party Debt [Member]
USD ($)
Sep. 30, 2014
Other Nonoperating Income (Expense) [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Sep. 30, 2013
Other Nonoperating Income (Expense) [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Sep. 30, 2014
Other Nonoperating Income (Expense) [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Sep. 30, 2013
Other Nonoperating Income (Expense) [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Sep. 30, 2014
Interest Expense [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Sep. 30, 2013
Interest Expense [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Sep. 30, 2014
Interest Expense [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Sep. 30, 2013
Interest Expense [Member]
Cross-currency swap agreements [Member]
Not designated as hedging instrument [Member]
USD ($)
Derivatives [Line Items]                          
Foreign subsidiaries third-party debt denominated in local currencies         $ 182,600,000                
Payments in connection with termination of cross-currency swap   105,000,000                      
Proceeds in connection with termination of cross-currency swap 108,900,000                        
Notional amount     109,600,000 105,000,000                  
Net expense realized or recognized on cross-currency swap agreement           $ 0 $ 485,000 $ (86,000) $ 507,000 $ 0 $ (640,000) $ (1,184,000) $ (2,172,000)