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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2015
Capital Stock [Abstract]  
Issuances of Common Stock
Shares Issued Related To:20152014
Directors' compensation48,90356,740
Vesting incentive plan shares(1)-500,000
Shares sold directly to employees(1)-257,895
Total shares of Class A Common Stock issued48,903814,635