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Discontinued Operations (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2015
Aug. 31, 2012
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Summary of operating results of the discontinued operations              
Expenses and selling, general and administrative     $ 337 $ 225 $ 493 $ 422  
Recovery attributable to expropriation and impairments     (476) (16,563) (16,982) (32,984)  
Other (income) loss, net     (53) (1,352) (2,374) (3,885)  
Benefit from income taxes     (62) (79) (104) (49)  
Income (loss) from discontinued operations, net of tax     254 17,769 18,967 36,496  
Summary of balance sheet data for discontinued operations              
Cash     358   358   $ 431
Accounts receivable             71
Other current assets     39   39   35
Total current assets associated with discontinued operations     397   397   537
Deferred tax assets     16,506   16,506   17,469
Total assets associated with discontinued operations     16,903   16,903   18,006
Accounts payable             215
Accrued liabilities     929   929   1,851
Total current liabilities associated with discontinued operations     929   929   2,066
Other long-term liabilities     154   154   317
Total liabilities associated with discontinued operations     1,083   1,083   2,383
Venezuela              
Discontinued Operations              
Sale price of expropriated assets   $ 441,700          
Installment payments, including an annual charge, received from sale of expropriated assets       18,100 18,700 35,900  
Remaining expected proceeds from sale of expropriated assets         99,000    
Summary of operating results of the discontinued operations              
Expenses and selling, general and administrative     150 121 234 245  
Recovery attributable to expropriation and impairments     (476) (16,563) (16,982) (32,984)  
Other (income) loss, net     (53) (1,472) (2,374) (3,858)  
Income (loss) from discontinued operations, net of tax     379 17,914 19,122 36,597  
Summary of balance sheet data for discontinued operations              
Cash     358   358   431
Accounts receivable             2
Other current assets     39   39   35
Total current assets associated with discontinued operations     397   397   468
Total assets associated with discontinued operations     397   397   468
Accounts payable             214
Accrued liabilities     769   769   1,124
Total current liabilities associated with discontinued operations     769   769   1,338
Other long-term liabilities     154   154   317
Total liabilities associated with discontinued operations     923   923   1,655
Venezuela | Subsequent events              
Discontinued Operations              
Installment payments, including an annual charge, received from sale of expropriated assets $ 18,900            
Contract Water Treatment Business              
Summary of operating results of the discontinued operations              
Expenses and selling, general and administrative     187 104 259 177  
Other (income) loss, net       120   (27)  
Benefit from income taxes     (62) (79) (104) (49)  
Income (loss) from discontinued operations, net of tax     (125) $ (145) (155) $ (101)  
Summary of balance sheet data for discontinued operations              
Accounts receivable             69
Total current assets associated with discontinued operations             69
Deferred tax assets     16,506   16,506   17,469
Total assets associated with discontinued operations     16,506   16,506   17,538
Accounts payable             1
Accrued liabilities     160   160   727
Total current liabilities associated with discontinued operations     160   160   728
Total liabilities associated with discontinued operations     $ 160   $ 160   $ 728