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Fair value measurements (other financial instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Carrying value [Member]    
Fair value measurements, other financial instruments [Line Items]    
Loans and notes receivable from Safeguard distributors $ 41,645 $ 23,278
Long-term debt [1] 718,706 756,963
Carrying value [Member] | Cash [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 34,780 76,574
Carrying value [Member] | Funds held for customers [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 63,699 66,289
Fair value [Member]    
Fair value measurements, other financial instruments [Line Items]    
Loans and notes receivable from Safeguard distributors 38,742 21,145
Long-term debt [1] 719,500 758,000
Fair value [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Loans and notes receivable from Safeguard distributors 0 0
Long-term debt [1] 0 0
Fair value [Member] | Significant other observable inputs (Level 2) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Loans and notes receivable from Safeguard distributors 0 0
Long-term debt [1] 719,500 758,000
Fair value [Member] | Significant unobservable inputs (Level 3) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Loans and notes receivable from Safeguard distributors 38,742 21,145
Long-term debt [1] 0 0
Fair value [Member] | Cash [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 34,780 76,574
Fair value [Member] | Cash [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 34,780 76,574
Fair value [Member] | Cash [Member] | Significant other observable inputs (Level 2) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 0 0
Fair value [Member] | Cash [Member] | Significant unobservable inputs (Level 3) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 0 0
Fair value [Member] | Funds held for customers [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 63,699 66,289
Fair value [Member] | Funds held for customers [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 63,699 66,289
Fair value [Member] | Funds held for customers [Member] | Significant other observable inputs (Level 2) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash 0 0
Fair value [Member] | Funds held for customers [Member] | Significant unobservable inputs (Level 3) [Member]    
Fair value measurements, other financial instruments [Line Items]    
Cash $ 0 $ 0
[1] Amounts exclude capital lease obligations.