Income Taxes: Current and Deferred Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current	$ 14,910	$ (6)	$ (163)
Deferred	7,690	16,518	13,582
Total income tax expense	$ 22,600	$ 16,512	$ 13,419