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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Prepaid assets - affiliates (less than)   $ 0
Allowance for doubtful accounts $ 2,400 $ 2,300
Preferred stock par value per share (in dollars per share) $ 0.01 $ 0.01
Preferred stock shares authorized (shares) 20,000,000 20,000,000
Preferred stock shares issued (shares) 1,610,000 0
Preferred stock shares outstanding (shares) 1,610,000 0
Common Class A    
Common stock par value per share (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (shares) 120,000,000 120,000,000
Common stock shares issued (shares) 6,499,504 6,496,559
Common stock shares outstanding (shares) 6,499,504 6,496,559
Common Class B    
Common stock par value per share (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (shares) 60,000,000 60,000,000
Common stock shares issued (shares) 10,742,563 10,224,742
Common stock shares outstanding (shares) 10,742,563 10,224,742