4) Stock-based Compensation: Schedule of stock inventive plan changes (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Outstanding at January 1, 2013	2.18
Class A Common Stock
Outstanding at January 1, 2013	972,253
Weighted average contractual term of optionsexercisable	4.66 years
Class C Common Stock
Outstanding at January 1, 2013	5,838,505
Class C Common Stock
Weighted average contractual term of optionsexercisable	2.55 years
Aggregated intrinsic value of options outstanding	2,270,018
Aggregated intrinsic value of options exercisable	2,270,018
Class A Common Stock
Aggregated intrinsic value of options outstanding	4,175,255
Aggregated intrinsic value of options exercisable	3,820,834