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SELECTED QUARTERLY FINANCIAL RESULTS (UNAUDITED) - (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 100,466 $ 103,591 $ 104,762 $ 115,596 $ 119,970 $ 110,946 $ 101,611 $ 93,092 $ 424,415 $ 425,619 $ 344,114
Operating expenses 95,190 100,031 101,557 107,718 109,021 101,480 93,341 86,528 404,496 390,370 318,274
Income from operations 5,276 3,560 3,205 7,878 10,949 9,466 8,270 6,564 19,919 35,249 25,840
Interest expense (8,042) (7,334) (7,630) (6,929) (6,458) (6,418) (4,612) (7,570) (29,935) (25,058) (4,777)
Other, net (1,676) 221 (1,203) (4,126) (2,616) (790) (1,976) (215) (6,784) (5,597) (877)
Income tax benefit (Note 9) (768) (991) 0 0         (1,759) 0 0
Net (loss) income $ (3,674) $ (2,562) $ (5,628) $ (3,177) $ 1,875 $ 2,258 $ 1,682 $ (1,221) $ (15,041) $ 4,594 $ 20,186
Basic and diluted (USD per share) $ (0.05) $ (0.04) $ (0.10) $ (0.06) $ 0.03 $ 0.03 $ 0.02 $ (0.02) $ (0.24) $ 0.06 $ 0.15