Supplemental Guarantors Consolidating Condensed Financial Information (Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions
REVENUE	$ 23,700	$ 24,340	$ 44,295	$ 36,290
EXPENSES:
Depreciation and amortization	21,969	24,805	44,232	39,906
Cost of sales	33	11	43	33
Selling, general and administrative	5,005	4,668	10,651	10,627
Total operating expenses	27,007	29,484	54,926	50,566
INCOME (LOSS) FROM OPERATIONS	(3,307)	(5,144)	(10,631)	(14,276)
Interest expense, net	(6,187)	(6,334)	(12,397)	(12,690)
Foreign currency exchange gains (losses)	(34)	(10)	(85)	163
Other income	96	4	96	10
Income (loss) before income taxes and equity in income (loss) of subsidiaries	(9,432)	(11,484)	(23,017)	(26,793)
Provision (benefit) for income taxes	204	(2,249)	(2)	(3,694)
Equity in income (loss) of subsidiaries	0	0	0	0
NET LOSS	(9,636)	(9,235)	(23,015)	(23,099)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions
REVENUE	(601)	(369)	(942)	(712)
EXPENSES:
Depreciation and amortization	(12)	(12)	(25)	(25)
Cost of sales	(276)	(56)	(290)	(56)
Selling, general and administrative	(325)	(328)	(652)	(656)
Total operating expenses	(613)	(396)	(967)	(737)
INCOME (LOSS) FROM OPERATIONS	12	27	25	25
Interest expense, net	0	0	0	0
Foreign currency exchange gains (losses)	0	0	0	0
Other income	0	0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries	12	27	25	25
Provision (benefit) for income taxes	0	0	0	0
Equity in income (loss) of subsidiaries	3,386	991	10,893	13,867
NET LOSS	3,398	1,018	10,918	13,892
Parent [Member]
Condensed Financial Statements, Captions
REVENUE	0	0	0	0
EXPENSES:
Depreciation and amortization	0	0	0	0
Cost of sales	0	0	0	0
Selling, general and administrative	137	360	260	573
Total operating expenses	137	360	260	573
INCOME (LOSS) FROM OPERATIONS	(137)	(360)	(260)	(573)
Interest expense, net	(6,039)	(5,646)	(11,913)	(11,302)
Foreign currency exchange gains (losses)	0	0	0	0
Other income	0	0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries	(6,176)	(6,006)	(12,173)	(11,875)
Provision (benefit) for income taxes	0	0	0	0
Equity in income (loss) of subsidiaries	(3,460)	(3,229)	(10,842)	(11,224)
NET LOSS	(9,636)	(9,235)	(23,015)	(23,099)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions
REVENUE	19,291	18,806	33,093	29,280
EXPENSES:
Depreciation and amortization	18,366	20,256	34,482	29,166
Cost of sales	317	62	327	77
Selling, general and administrative	4,010	3,370	8,637	7,457
Total operating expenses	22,693	23,688	43,446	36,700
INCOME (LOSS) FROM OPERATIONS	(3,402)	(4,882)	(10,353)	(7,420)
Interest expense, net	(145)	(599)	(466)	(1,206)
Foreign currency exchange gains (losses)	2	0	2	0
Other income	0	3	0	9
Income (loss) before income taxes and equity in income (loss) of subsidiaries	(3,545)	(5,478)	(10,817)	(8,617)
Provision (benefit) for income taxes	1	16	(1)	(11)
Equity in income (loss) of subsidiaries	74	2,238	(51)	(2,643)
NET LOSS	(3,472)	(3,256)	(10,867)	(11,249)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions
REVENUE	5,010	5,903	12,144	7,722
EXPENSES:
Depreciation and amortization	3,615	4,561	9,775	10,765
Cost of sales	(8)	5	6	12
Selling, general and administrative	1,183	1,266	2,406	3,253
Total operating expenses	4,790	5,832	12,187	14,030
INCOME (LOSS) FROM OPERATIONS	220	71	(43)	(6,308)
Interest expense, net	(3)	(89)	(18)	(182)
Foreign currency exchange gains (losses)	(36)	(10)	(87)	163
Other income	96	1	96	1
Income (loss) before income taxes and equity in income (loss) of subsidiaries	277	(27)	(52)	(6,326)
Provision (benefit) for income taxes	203	(2,265)	(1)	(3,683)
Equity in income (loss) of subsidiaries	0	0	0	0
NET LOSS	$ 74	$ 2,238	$ (51)	$ (2,643)