Consolidated Statements Of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
REVENUE	$ 94,546	$ 100,252	$ 198,037
EXPENSES:
Depreciation and amortization	75,078	80,923	121,023
Cost of sales	76	195	304
Selling, general and administrative	24,119	22,184	29,799
Total operating expenses	99,273	103,302	151,126
INCOME (LOSS) FROM OPERATIONS	(4,727)	(3,050)	46,911
Interest expense	(25,337)	(25,430)	(25,222)
Interest income	370	40	193
Foreign currency exchange gains (losses)	109	(1,650)	(1,974)
Other income	1,765	5	63
Income (loss) before income taxes	(27,820)	(30,085)	19,971
Provision (benefit) for income taxes	(3,396)	79,905	10,293
NET INCOME (LOSS)	$ (24,424)	$ (109,990)	$ 9,678