Guarantor Non-Guarantor - (Statement of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
REVENUE	$ 70,327	$ 51,556	$ 46,028	$ 72,547	$ 70,759	$ 52,208	$ 35,545	$ 59,496	$ 240,458	$ 218,008	$ 175,556
EXPENSES:
Depreciation and amortization									139,754	142,963	175,592
Cost of sales									464	100	97
Selling, general and administrative									29,088	31,649	31,831
Total operating expenses									169,306	174,712	207,520
INCOME (LOSS) FROM OPERATIONS	28,939	8,904	8,335	24,974	18,954	10,506	4,335	9,501	71,152	43,296	(31,964)
Interest expense, net									(29,011)	(34,767)	(40,536)
Foreign currency exchange gains (losses)									681	(726)	441
Loss on early extinguishment of debt									0	(7,912)	0
Gain on sale of marketable securities									230	2,467	4,188
Other income									780	250	446
Income (loss) before income taxes									43,832	2,608	(67,425)
Provision (benefit) for income taxes									6,782	392	(4,008)
Equity in Income (Loss) of Subsidiaries									0	0	0
NET INCOME (LOSS)	19,945	1,129	1,270	14,706	11,842	(5,111)	(5,026)	511	37,050	2,216	(63,417)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
REVENUE									0	0	0
EXPENSES:
Depreciation and amortization									0	0	0
Cost of sales									0	0	0
Selling, general and administrative									2,117	1,503	3,219
Total operating expenses									2,117	1,503	3,219
INCOME (LOSS) FROM OPERATIONS									(2,117)	(1,503)	(3,219)
Interest expense, net									(21,542)	(14,124)	(20,115)
Foreign currency exchange gains (losses)									0	0	0
Loss on early extinguishment of debt										(7,912)
Gain on sale of marketable securities									0	0	0
Other income									21	4	2
Income (loss) before income taxes									(23,638)	(23,535)	(23,332)
Provision (benefit) for income taxes									0	0	0
Equity in Income (Loss) of Subsidiaries									60,688	25,751	(40,085)
NET INCOME (LOSS)									37,050	2,216	(63,417)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
REVENUE									157,324	152,759	131,417
EXPENSES:
Depreciation and amortization									88,724	92,106	126,593
Cost of sales									446	88	87
Selling, general and administrative									17,607	19,626	19,612
Total operating expenses									106,777	111,820	146,292
INCOME (LOSS) FROM OPERATIONS									50,547	40,939	(14,875)
Interest expense, net									(6,015)	(19,805)	(20,173)
Foreign currency exchange gains (losses)									(4)	4	24
Loss on early extinguishment of debt										0
Gain on sale of marketable securities									230	2,467	4,188
Other income									759	67	319
Income (loss) before income taxes									45,517	23,672	(30,517)
Provision (benefit) for income taxes									1,377	(418)	(328)
Equity in Income (Loss) of Subsidiaries									16,548	1,661	(9,896)
NET INCOME (LOSS)									60,688	25,751	(40,085)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
REVENUE									84,435	66,644	47,892
EXPENSES:
Depreciation and amortization									51,030	50,857	48,999
Cost of sales									18	12	10
Selling, general and administrative									10,665	11,915	12,753
Total operating expenses									61,713	62,784	61,762
INCOME (LOSS) FROM OPERATIONS									22,722	3,860	(13,870)
Interest expense, net									(1,454)	(838)	(248)
Foreign currency exchange gains (losses)									685	(730)	417
Loss on early extinguishment of debt										0
Gain on sale of marketable securities									0	0	0
Other income									0	179	125
Income (loss) before income taxes									21,953	2,471	(13,576)
Provision (benefit) for income taxes									5,405	810	(3,680)
Equity in Income (Loss) of Subsidiaries									0	0	0
NET INCOME (LOSS)									16,548	1,661	(9,896)
Consolidating Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
REVENUE									(1,301)	(1,395)	(3,753)
EXPENSES:
Depreciation and amortization									0	0	0
Cost of sales									0	0	0
Selling, general and administrative									(1,301)	(1,395)	(3,753)
Total operating expenses									(1,301)	(1,395)	(3,753)
INCOME (LOSS) FROM OPERATIONS									0	0	0
Interest expense, net									0	0	0
Foreign currency exchange gains (losses)									0	0	0
Loss on early extinguishment of debt										0
Gain on sale of marketable securities									0	0	0
Other income									0	0	0
Income (loss) before income taxes									0	0	0
Provision (benefit) for income taxes									0	0	0
Equity in Income (Loss) of Subsidiaries									(77,236)	(27,412)	49,981
NET INCOME (LOSS)									$ (77,236)	$ (27,412)	$ 49,981