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Debt (Details)
$ in Thousands, ¥ in Millions, ₩ in Billions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
KRW (₩)
Mar. 23, 2016
USD ($)
Mar. 23, 2016
CNY (¥)
Dec. 26, 2015
USD ($)
Debt Instrument [Line Items]          
Long-term debt $ 227,364       $ 216,010
Debt Issuance Costs (957)       0
Less current portion of debt (13,655)       (11,760)
Long-term debt 213,709       204,250
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 200,000       0
Debt, stated interest rate 2.49% 2.49%      
Debt instrument maturity date Dec. 06, 2021        
Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 0       200,000
Debt instrument maturity date Dec. 31, 2017        
Mueller Xingrong Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 3,048       5,275
Debt, stated interest rate 4.35% 4.35%      
Debt instrument maturity date Dec. 31, 2017        
Jungwoo Mueller Line of Credit Due 2017 [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 4,724       0
Debt, stated interest rate 2.82% 2.82%      
Debt instrument maturity date Dec. 31, 2017        
Jungwoo Mueller Line of Credit Due 2018 [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 7,990       0
Debt, stated interest rate 3.28% 3.28%      
Debt instrument maturity date Dec. 31, 2018        
2001 Series IRB [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 4,250       5,250
Debt, stated interest rate 1.23% 1.23%      
Debt instrument maturity date Dec. 31, 2021        
Other [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 8,309       $ 5,485
Mueller Xingrong Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility maximum borrowing capacity     $ 21,700 ¥ 150  
Credit Agreement [Member]          
Line of Credit Facility [Line Items]          
Debt instrument variable rate basis Borrowings under the Revolving Credit Facility bear interest, at the Company’s option, at LIBOR or Base Rate as defined by the Credit Agreement, plus a variable premium. LIBOR advances may be based upon the one, three, or six-month LIBOR.        
Outstanding letters of credit $ 7,000        
Terms of the letters of credit 1 year        
Credit Agreement [Member] | LIBOR [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.15%        
Credit Agreement [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.15%        
Credit Agreement [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Credit facility commitment fee 0.15%        
Credit Agreement [Member] | Minimum [Member] | LIBOR [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.125%        
Credit Agreement [Member] | Minimum [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.125%        
Credit Agreement [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Credit facility commitment fee 0.30%        
Credit Agreement [Member] | Maximum [Member] | LIBOR [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.625%        
Credit Agreement [Member] | Maximum [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.625%        
Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility, current borrowing capacity $ 350,000        
Jungwoo-Mueller [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility maximum borrowing capacity $ 30,300 ₩ 35.7