Income Taxes: Deferred income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	$ 3,942	$ (1,198)	$ (4,354)
Allowance for Doubtful Accounts [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	0	4	4
Inventory Valuation Reserve [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	284	(488)	341
State and Local Jurisdiction [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	502	(4)	552
Acquired future tax deductions [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	3,139	96	40
Depreciation and Amortization [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	1,080	(780)	(3,850)
Operating Income (Loss) [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	195	62	0
Tax credits [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	(635)	1,238	(971)
Valuation Allowance of Deferred Tax Assets [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	2,354	0	0
Accruals other [Member]
Components of deferred tax provision [Line Items]
Deferred Income Tax Expense (Benefit)	$ (2,977)	$ (1,326)	$ (470)