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Stockholders' Equity:AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance, net of taxes $ 672,590 $ 674,549
Amortization of actuarial (gain) loss, before taxes (a) [1] (43) 821
Income taxes 11 (208)
Ending balance, net of taxes 679,017 707,052
Accumulated Other Comprehensive Loss [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance, net of taxes (47,652) (76,702)
Ending balance, net of taxes $ (47,684) $ (76,089)
[1] Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 8, Retirement and Benefit Plans.