Annual report pursuant to Section 13 and 15(d)

Derivative Instruments And Hedging Strategies (Fair Values Of Derivative Instruments) (Details)

v3.8.0.1
Derivative Instruments And Hedging Strategies (Fair Values Of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 0 $ 0
Derivative Liability 0 19,472
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 36
Three Point Seven Five Percentage Convertible Notes [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Embedded Derivative, Fair Value of Embedded Derivative Asset 0 0
Embedded Derivative, Fair Value of Embedded Derivative Liability $ 0 $ 19,436
SeaJon | Cash Flow Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Fixed Interest Rate 2.79%