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FAIR VALUE MEASUREMENTS (Details)
$ / shares in Units, AUD in Thousands
3 Months Ended
Jan. 17, 2017
USD ($)
shares
Dec. 31, 2017
AUD
Dec. 31, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
Sep. 30, 2017
Australian Dollar Forward Contract [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Gains recorded in Other Income for settled contracts     $ 7,000      
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Contracts revenue | AUD   AUD 15,000        
Contracts weighted average rate price (in dollars per share) | $ / shares     $ 1.28      
AOCI currency translation adjustment before tax         $ 130,000  
AOCI currency translation adjustment after tax         $ 42,000  
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   15 years 15 years      
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   179 days 179 days      
British Pound Sterling Forward Contract [Member] | Designated as Hedging Instrument [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Contracts revenue | AUD   AUD 1,422        
Contracts weighted average rate price (in dollars per share) | $ / shares     $ 0.74      
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Derivative asset, notional amount | AUD   AUD 4,129        
Derivative, average forward exchange rate   1.25     1.25  
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   28 days 28 days      
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   238 days 238 days      
Fair Value, Inputs, Level 2 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Insurance contracts fair value         $ 3,000,000  
Fair Value, Inputs, Level 2 [Member] | Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments     $ (237,000)      
Senior Notes 2022 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Debt instrument, interest rate, effective percentage   5.25%     5.25% 5.25%
Senior Notes 2022 [Member] | Fair Value, Inputs, Level 1 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Convertible debt, fair value disclosures         $ 1,020,000,000  
Convertible Notes 2017 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Debt instrument, interest rate, effective percentage 4.00%          
Debt conversion, converted instrument, amount $ 173,855,000     $ 173,855,000    
Debt conversion, converted instrument, cash received 125,000,000     $ 125,000,000    
Issuance of treasury stock in settlement of convertible debt $ 48,858,000          
Debt conversion, converted instrument, shares issued | shares 1,954,993     1,954,993    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Trading securities         3,352,000  
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Trading securities         $ 2,824,000  
Other Income [Member] | Fair Value, Inputs, Level 2 [Member] | Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Realized gains (losses)     $ 29,000