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Contingencies and Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Undiscounted reserve    
Reserve balance at beginning of year $ 5,714 $ 4,922
Expensed 851 1,445
Paid (524) (653)
Reserve balance at end of year 6,041 5,714
Ending balance recorded in:    
Other liabilities and accrued items 874 620
Other long-term liabilities 5,167 5,094
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligation at beginning of period 610 565
Accretion expense 49 45
Change in liability 425 0
Asset retirement obligation at end of period $ 1,084 $ 610