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SIGNIFICANT ACCOUNTING POLICIES: EPS (Details)
 12 Months Ended
Dec. 31, 2014
item
Common Stock  
Earnings per share:  
Voting right per share (in votes per share) 1tr_CommonStockVotingRightsPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Class B Common Stock  
Earnings per share:  
Voting right per share (in votes per share) 10tr_CommonStockVotingRightsPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember