Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Realized and Unrealized (Gain) Loss on Investments and Other Income, Net) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Realized and Unrealized (Gain) Loss on Investments and Other Income, Net) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Realized and unrealized (gain) loss on investments      
Unrealized (gain) on non-hedge derivative instruments $ 0   $ (242)
Realized and unrealized (gain) loss on investments 0   242
Other income (loss), net      
Loss on lease modifications and terminations 0   (771)
Loss on extinguishment of debt, net (16)   (52)
Collateral management fee income, net 128   154
Equity in earnings of equity method investments 341   379
Gain (loss) on sale of long-lived assets and intangibles 5,029   (206)
Other income 6   90
Other income (loss), net $ 5,488 $ (406) $ (406)