CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Class A Common Shares [Member]
Common shares, par value	$ 0.01	$ 0.01
Common shares, authorized	100,000,000	100,000,000
Common shares, outstanding	36,828,991	35,667,521
Common shares, issued	36,828,991	35,667,521
Class B Common Shares [Member]
Common shares, par value	$ 0.01	$ 0.01
Common shares, authorized	5,000,000	5,000,000
Common shares, outstanding	1,247,060	1,322,365
Common shares, issued	1,247,060	1,322,365
Series A Preferred Shares [Member]
Common shares, outstanding	2,800,000	2,800,000
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	10,000,000	10,000,000
Preferred shares, outstanding	2,800,000	2,800,000
Preferred shares, issued	2,800,000	2,800,000
Preferred shares, liquidation preference	$ 70,000	$ 70,000