Consolidation of RiverFront Investment Partners I, LLC. - RiverFront remeasurement balance sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Land	$ 127,700	$ 127,700
Cash	6,961	4,524		$ 106	$ 0
Cash held in escrow	269	333
Accounts receivable	907	1,020
Total Assets	417,984	418,734
Long-term Debt	28,545	29,664
Total Liabilities and Capital	417,984	418,734
Gain on remeasurement
Land			$ 21,107
Building and improvements, net			34,362
Value of leases in place			4,727
Cash			0
Cash held in escrow			0
Accounts receivable			0
Prepaid expenses			0
Total Assets			60,196
Long-term Debt			0
Amortizable debt costs			0
Other liabilities			0
Equity – FRP			39,727
Equity - MRP			20,469
Total Liabilities and Capital			60,196
RiverFront on the Anacostia
Land			28,327
Building and improvements, net			116,135
Value of leases in place			4,727
Cash			2,295
Cash held in escrow			171
Accounts receivable			40
Prepaid expenses			142
Total Assets	$ 142,121	144,386	151,837
Long-term Debt			78,587
Amortizable debt costs			(852)
Other liabilities			905
Equity – FRP			48,310
Equity - MRP			24,887
Total Liabilities and Capital			151,837
Riverfront Holdings I, LLC
Land			7,220
Building and improvements, net			81,773
Value of leases in place			0
Cash			2,295
Cash held in escrow			171
Accounts receivable			40
Prepaid expenses			142
Total Assets			91,641
Long-term Debt			78,587
Amortizable debt costs			(852)
Other liabilities			905
Equity – FRP		$ 0	8,583
Equity - MRP			4,418
Total Liabilities and Capital			$ 91,641