CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Intangible assets, accumulated amortization	$ 6,827	$ 6,840
Shareholders' Equity:
Preferred shares - par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares - authorized (in shares)	29,000,000	29,000,000
Preferred shares - outstanding (in shares)	14,703,214	14,703,214
Series C, D and E Preferred Shares
Shareholders' Equity:
Preferred shares - liquidation preference value (in dollars per share)	$ 25.00	$ 25.00
Series C Preferred Shares
Shareholders' Equity:
Preferred shares - issued (in shares)	3,000,000	3,000,000
Preferred shares - outstanding (in shares)	3,000,000	3,000,000
Series D Preferred Shares
Shareholders' Equity:
Preferred shares - issued (in shares)	7,701,700	7,701,700
Preferred shares - outstanding (in shares)	7,701,700	7,701,700
Series E Preferred Shares
Shareholders' Equity:
Preferred shares - issued (in shares)	4,001,514	4,001,514
Preferred shares - outstanding (in shares)	4,001,514	4,001,514
Class A Common Shares
Shareholders' Equity:
Common shares - par value (in dollars per share)	$ 0.01	$ 0.01
Common shares - authorized (in shares)	104,000,000	104,000,000
Common shares - issued (in shares)	39,217,475	38,843,482
Common shares - outstanding (in shares)	39,217,475	38,843,482
Class B Common Shares
Shareholders' Equity:
Common shares - par value (in dollars per share)	$ 0.01	$ 0.01
Common shares - authorized (in shares)	1,000,000	1,000,000
Common shares - issued (in shares)	0	0
Common shares - outstanding (in shares)	0	0