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DERIVATIVE INSTRUMENTS 1 (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Effect of derivatives on statements of operations  
The effect of derivative instruments not designated as hedging instruments on the accompanying consolidated statements of operations was as follows (in thousands): 
 
 
Statement of
Operations Location
 
Income Recognized in
Earnings on Derivatives
 
 
Years Ended December 31,
Derivative Instrument
 
2013
 
2012
 
2011
Convertible debt -conversion feature
 
Other income (loss)
 
$
—

 
$
—

 
$
3,079
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location
The fair value of outstanding derivative instruments not designated as hedging instruments on the accompanying Consolidated Balance Sheets was as follows (in thousands): 
Derivative Instruments
 
Balance Sheet Location
 
March 31, 2014
Canadian dollar foreign exchange forward contracts
 
Other current assets
 
$
246

Canadian dollar foreign exchange forward contracts
 
Other current liabilities
 
(7,036
)
The effect of derivative instruments not designated as hedging instruments on the accompanying Consolidated Statements of Operations was as follows (in thousands): 
Derivative Instruments
 
Statement of
Operations Location
 
Three Months Ended March 31, 2014
Canadian dollar foreign exchange forward contracts
 
Loss on foreign exchange
 
$
(6,790
)