Consolidated Statements Of Operations (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
REVENUE	$ 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	71,152	43,296	(31,964)
Interest expense	(29,143)	(35,246)	(41,094)
Interest income	132	479	558
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)
NET INCOME (LOSS)	$ 37,050	$ 2,216	$ (63,417)