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Credit Facility Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 18, 2019
Sep. 30, 2019
Dec. 31, 2018
Jan. 05, 2018
Jun. 23, 2015
Debt Instrument [Line Items]          
Debt instrument, face amount       $ 1,200,000 $ 725,000
Line of credit facility, maximum borrowing capacity       500,000  
Swingline sub-facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity       50,000  
Line of credit facility, amount outstanding   $ 0      
USD Denominated Term Loan [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount       650,000  
Line of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit facility, amount outstanding   0 $ 0    
Line of credit facility, remaining borrowing capacity   $ 455,845 $ 459,017    
Standby Letters of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity       $ 300,000  
Secured Debt [Member]          
Debt Instrument [Line Items]          
Debt instrument, collateral   All obligations under the 2018 credit facility are guaranteed by Itron, Inc. and material U.S. domestic subsidiaries and are secured by a pledge of substantially all of the assets of Itron, Inc. and material U.S. domestic subsidiaries, including a pledge of their related assets. This includes a pledge of 100% of the capital stock of material U.S. domestic subsidiaries and up to 66% of the voting stock (100% of the non-voting stock) of first-tier foreign subsidiaries. In addition, the obligations of any foreign subsidiary who is a foreign borrower, as defined by the 2018 credit facility, are guaranteed by the foreign subsidiary and by its direct and indirect foreign parents.      
Minimum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage   0.18%      
Maximum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage   0.35%      
London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   the LIBOR rate      
Debt instrument, basis spread on variable rate   1.75%      
Applicable interest rate   3.80%      
EURIBOR [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   EURIBOR rate      
Alternate base rate (1) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   the prime rate      
Alternate base rate (2) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   the Federal Reserve effective rate      
Fed Funds Effective Rate Overnight Index Swap Rate [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate   0.50%      
Alternate base rate (3) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   one-month LIBOR      
Debt instrument, basis spread on variable rate   1.00%      
Alternate base rate [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   Alternate Base Rate      
Subsequent Event [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage 0.15%        
Applicable interest rate 1.00%        
Subsequent Event [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage 0.25%        
Applicable interest rate 1.75%