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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 3 months ended Mar. 31, 2017 - USD ($)
shares in Thousands, $ in Thousands
Total
Total Stockholders' Equity
Common Stock
Class A Common Stock
Common Stock
Class B Common Stock
Accumulated Other Comprehensive Income (Loss)
Additional Paid-in Capital
Retained Earnings (Deficit)
Non-controlling Interest
Balance at beginning of period (in shares) at Dec. 31, 2016     6,497 10,225        
Balance at beginning of period at Dec. 31, 2016 $ 123,736 $ 30,303 $ 65 $ 103 $ 11 $ 25,413 $ 4,711 $ 93,433
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock based compensation 531 531       531    
Restricted stock unit vesting (in shares)     3          
Restricted stock unit vesting 78 78 $ 0     78    
Consolidated net income 11,386 2,269         2,269 9,117
Foreign currency translation adjustment for equity method investee (49) (18)     (18)     (31)
Distributions paid to non-controlling unit holders (4,347)             (4,347)
Net contribution of the Major Energy Companies 260             260
Dividends paid to Class A common stockholders (2,355) (2,355)         (2,355)  
Conversion of Convertible Subordinated Notes to Class B Common Stock (in shares)       518        
Conversion of Convertible Subordinated Notes to Class B Common Stock 7,795 7,795   $ 5   7,790   0
Balance at end of period (in shares) at Mar. 31, 2017     6,500 10,743        
Balance at end of period at Mar. 31, 2017 $ 137,035 $ 38,603 $ 65 $ 108 $ (7) $ 33,812 $ 4,625 $ 98,432