Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Consolidated Statement Of Cash Flows (Additional Information) (Details)

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QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Consolidated Statement Of Cash Flows (Additional Information) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]                    
Cash and cash equivalents $ 10,790 $ 10,926 $ 5,704 $ 10,227 $ 10,865 $ 10,309 $ 13,983 $ 8,661 $ 12,958  
Restricted cash 1,065 1,098 6,124 1,220 1,342 3,054 3,063 3,002 2,954  
Restricted cash, long-term 5,000 5,000 0 5,000 5,000 12,000 20,000 20,000 20,000  
Total cash, cash equivalents and restricted cash at the end of period $ 16,855 $ 17,023 $ 11,828 $ 16,447 $ 17,207 $ 25,363 $ 37,046 $ 31,663 $ 35,912 $ 36,658