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FAIR VALUE MEASUREMENTS (Details)
$ / shares in Units, AUD in Thousands
3 Months Ended
Jan. 17, 2017
USD ($)
shares
Dec. 31, 2016
AUD
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Investment sales     $ 0 $ 715,000    
Australian Dollar Forward Contract [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Gains recorded in Other Income for settled contracts     $ 649      
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Contracts Revenue | AUD   AUD 16,500        
Contracts Weighted Average Rate Price | $ / shares     $ 1.39      
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Before Tax         $ 974,000  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax         $ 619,000  
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   30 days 30 days      
Australian Dollar Forward Contract [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   180 days 180 days      
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Derivative asset, notional amount | AUD   AUD 4,655        
Derivative, average forward exchange rate   1.34     1.34  
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   30 days 30 days      
Canadian Dollar Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Foreign currency contracts duration   180 days 180 days      
Fair Value, Inputs, Level 2 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Insurance contracts fair value         $ 3,347,000  
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     $ (111,000)      
Convertible Notes 2017 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Debt instrument, interest rate, effective percentage   4.00%     4.00%  
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         $ 730,438,000  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Trading securities         1,375,000  
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Trading securities         $ 1,000,000  
Other Nonoperating Income (Expense) [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Available-for-sale Securities, Gross Realized Losses     13,000      
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)     $ 41      
Subsequent Event [Member] | Convertible Notes 2017 [Member]            
FAIR VALUE MEASUREMENTS (Details) [Line Items]            
Debt conversion, converted instrument, amount $ 173,855          
Debt conversion, converted instrument, cash received $ 125,000          
Debt conversion, converted instrument, shares issued | shares 1,954,993