Income Taxes: Deferred income tax assets (liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets and liabilities [Line Items]
Non-current deferred tax asset	$ 17,099	$ 13,941
Non-current deferred tax asset, gross total [Member]
Deferred tax assets and liabilities [Line Items]
Deferred Tax Assets, State Taxes	(1,647)	(1,862)
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	3,881	1,905
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,432	2,604
Noncurrent deferred tax asset - depreciation and amortization	(11,735)	(5,594)
Noncurrent deferred tax asset - acquired future tax deductions	5,778	639
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	8,864	6,778
Deferred Tax Assets, Unrealized Currency Losses	5,360	2,680
Noncurrent deferred tax asset - tax credits state	5,887	5,102
Deferred Tax Assets, Inventory	1,633	1,538
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	0	151
Deferred Tax Assets, Valuation Allowance, Noncurrent	(2,354)	0
Noncurrent deferred tax liability [Member]
Deferred tax assets and liabilities [Line Items]
Noncurrent deferred tax liability - foreign	1,372	1,376
Deferred Tax Liabilities, Net	$ 1,372	$ 1,376