RESTRICTED CASH - Restricted Cash (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash		$ 1,233	$ 8,080
Cash and cash equivalents		68,735	148,374
Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows	[1]	69,968	156,454	$ 172,356	$ 157,617
Restricted cash deposited with LKE intermediary
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash		758	7,530
Restricted cash held in escrow
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash		$ 475	$ 550

[1] Interest paid is presented net of patronage payments received of $4.0 million, $4.1 million and $3.0 million for the years ended December 31, 2019, 2018 and 2017, respectively. For additional information on patronage payments, see Note 6 — Debt.