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Contingencies and Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Undiscounted reserve    
Reserve balance at beginning of year $ 6,499 $ 6,041
Expensed 718 1,006
Paid (696) (548)
Reserve balance at end of year 6,521 6,499
Ending balance recorded in:    
Other liabilities and accrued items 1,168 987
Other long-term liabilities $ 5,353 $ 5,512