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Stockholders' Equity:Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance, net of taxes $ 580,004 $ 534,670 $ 492,388
Net actuarial gain, current-period changes, before taxes 7,067 9,622 8,406
Amortization of actuarial loss, amounts reclassified from accumulated other comprehensive loss, before taxes [1] 1,686 2,484 4,884
Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes [1] 0 4,155 501
Income taxes (2,443) (6,258) (5,308)
Ending Balance, net of taxes 674,549 580,004 534,670
Accumulated Other Comprehensive Loss [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance, net of taxes (83,012) (93,015) (101,498)
Ending Balance, net of taxes $ (76,702) $ (83,012) $ (93,015)
[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 9, Retirement and Benefit Plans.