Quarterly report pursuant to Section 13 or 15(d)

LONG-LIVED ASSETS (Investments in Nonconsolidated Affiliates) (Details)

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LONG-LIVED ASSETS (Investments in Nonconsolidated Affiliates) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Summarized income statement    
Revenue $ 14,414 $ 13,810
Operating income 9,025 7,565
Net income 7,194 5,714
Net income attributable to the common stockholders of the equity investee $ 7,104 $ 5,702