REVENUE (Real Estate Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 28,938	$ 27,948	$ 27,975	$ 25,042	$ 22,647	$ 28,008	$ 27,912	$ 24,987
Revenue									$ 109,903	$ 103,554	$ 99,823
Real Estate
Disaggregation of Revenue [Line Items]
Revenue									21,252	8,304	26,300
Real Estate | Total land sales
Disaggregation of Revenue [Line Items]
Revenue									19,788	6,461	24,968
Real Estate | Conservation land sale
Disaggregation of Revenue [Line Items]
Revenue									0	0	5,056
Real Estate | Conservation easements
Disaggregation of Revenue [Line Items]
Revenue									2,610	3,730	0
Real Estate | Gig Harbor residential
Disaggregation of Revenue [Line Items]
Revenue									12,025	0	14,157
Real Estate | Gig Harbor commercial
Disaggregation of Revenue [Line Items]
Revenue									0	0	3,500
Real Estate | Bremerton residential
Disaggregation of Revenue [Line Items]
Revenue									0	1,375	0
Real Estate | Other residential
Disaggregation of Revenue [Line Items]
Revenue									770	751	2,255
Real Estate | Other commercial
Disaggregation of Revenue [Line Items]
Revenue									0	400	0
Real Estate | Unimproved land
Disaggregation of Revenue [Line Items]
Revenue									4,383	205	0
Real Estate | Rentals and other
Disaggregation of Revenue [Line Items]
Revenue									$ 1,464	$ 1,843	$ 1,332