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Mandatorily redeemable Series C preferred shares (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Dividend and Redemption Payments
Estimated dividend payments due in the next five years and dividend and redemption payments thereafter are:
2018
$
1,068

2019
1,282

2020
1,344

2021
1,364

2022
1,390

Thereafter to 2031
15,761

Redemption amount
5,340

 
27,549

Less amounts representing interest
(9,085
)
 
18,464

Less current portion
(1,068
)
 
$
17,396