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	$ 31,453	$ 38,904	$ 57,981
Cash and cash equivalents, beginning balance	51,228	36,428	42,920
Restricted cash, beginning balance	32,083	70,187	45,618
Cash, cash equivalents and restricted cash, beginning of period	83,311	106,615	88,538
Cash and cash equivalents, ending balance	36,814	51,228	36,428
Restricted cash , ending balance	50,206	32,083	70,187
Cash, cash equivalents and restricted cash, end of period	87,020	83,311	106,615
Proceeds from mortgages, notes and bonds payable
Mortgages and notes payable	10,942	25,675	123,345
Bonds payable	19,785	78,125	59,213
Proceeds from mortgages, other notes and bonds payable	30,727	103,800	182,558
Payment of mortgages, notes and bonds payable
Mortgages and notes payable	13,823	52,976	124,616
Bonds payable	19,592	21,742	0
Payment of mortgages, notes and bonds payable	$ 33,415	$ 74,718	$ 124,616