Annual report pursuant to Section 13 and 15(d)

SUMMARY QUARTERLY CONSOLIDATED FINANCIAL INFORMATION (UNAUDITED) (Details)

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SUMMARY QUARTERLY CONSOLIDATED FINANCIAL INFORMATION (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]                      
Total revenues $ 69,286 $ 87,419 $ 91,004 $ 66,660 $ 70,402 $ 81,691 $ 81,360 $ 59,141 $ 314,369 $ 292,594 $ 298,880
Total operating costs 79,262 94,619 87,976 78,946 90,493 86,012 87,113 73,887 340,803 337,505 338,054
Operating loss (9,976) (7,200) 3,028 (12,286) (20,091) (4,321) (5,753) (14,746) (26,434) (44,911) (39,174)
Total other income (expenses) 6,750 (6,875) (7,831) (4,009) (4,063) 3,850 1,557 2,331 (11,965) 3,675 116,699
Income tax expense 284 0 0 0 (82) (2) 510 539 284 965 189
(Loss) Income from continuing operations (3,510) (14,075) (4,803) (16,295) (24,072) (469) (4,706) (12,954) (38,683) (42,201)  
Preferred dividends (1,395) (1,395) (1,395) (1,395) (1,395) (1,395) (1,395) (1,395) (5,580) (5,580) (5,580)
(Loss) Income Applicable To Common Stockholders $ (4,905) $ (15,470) $ (6,198) $ (17,690) $ (25,467) $ (1,864) $ (6,101) $ (14,349) $ (44,263) $ (47,781) $ 71,499
Loss applicable to common stock, per share                      
Basic (in dollars per share) $ (0.07) $ (0.23) $ (0.09) $ (0.26) $ (0.38) $ (0.03) $ (0.09) $ (0.21) $ (0.66) $ (0.71) $ 1.07
Diluted (in dollars per share) $ (0.07) $ (0.23) $ (0.09) $ (0.26) $ (0.38) $ (0.03) $ (0.09) $ (0.21) $ (0.66) $ (0.71) $ 1.04
Weighted average number of shares of common stock outstanding                      
Basic (in shares) 67,027,104 66,992,322 66,977,104 66,977,104 66,963,297 66,932,744 66,874,155 66,841,977 66,993,543 66,903,457 66,709,925
Diluted (in shares) 67,027,104 66,992,322 66,977,104 66,977,104 66,963,297 66,932,744 66,874,155 66,841,977 66,993,543 66,903,457 68,788,440