Supplemental Cash Flows Information - Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 27,127	$ 29,430	$ 61,587
Cash and cash equivalents, beginning balance	51,179	36,358	42,705
Restricted cash and cash equivalents, beginning balance	32,082	70,207	45,637
Cash and cash equivalents, ending balance	36,761	51,179	36,358
Restricted cash and cash equivalents, ending balance	50,206	32,082	70,207
Cash, cash equivalents and restricted cash, beginning of period	83,261	106,565	88,342
Cash, cash equivalents and restricted cash, end of period	86,967	83,261	106,565
Proceeds from mortgages, notes and bonds payable
Proceeds from mortgages and notes payable	10,942	25,675	123,345
Proceeds from bonds	19,785	78,125	59,213
Proceeds from mortgages, notes and bonds payable	30,727	103,800	182,558
Payment of mortgages, notes and bonds payable
Recurring payment on mortgages and notes payable	12,144	51,977	124,616
Bond payments	19,592	21,742	0
Payment of mortgages, notes and bonds payable	$ 31,736	$ 73,719	$ 124,616