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15. Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2014
Related Party Transactions Tables  
Amounts due to (due from) related parties
    2014     2013     2012  
Balance, beginning of year   $ 15,549     $ 17,522     $ 47,843  
Aircraft and equipment rental charges, and other     30,561       65,502       74,490  
Payments, net     (37,753 )     (67,475 )     (104,811 )
Balance, end of year   $ 8,357     $ 15,549     $ 17,522