Consolidated balance sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Total shares issued under the Reorganization Plan	46,390,513	46,827,762
Treasury stock, shares	261,103	0
Class A
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	180,000,000	180,000,000
Common stock, shares issued	46,651,616	38,956,250
Total shares issued under the Reorganization Plan	46,390,513	38,956,250
Common Class B
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	0	7,871,512
Total shares issued under the Reorganization Plan	0	7,871,512