Consolidated Statements Of Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
REVENUE	$ 202,874	$ 240,458	$ 218,008
EXPENSES:
Depreciation and amortization	121,598	139,754	142,963
Cost of sales	475	464	100
Selling, general and administrative	25,971	29,088	31,649
Total operating expenses	148,044	169,306	174,712
INCOME FROM OPERATIONS	54,830	71,152	43,296
Interest expense	(28,213)	(29,143)	(35,246)
Interest income	362	132	479
Foreign currency exchange gains (losses)	(2,222)	681	(726)
Loss on early extinguishment of debt	(1,504)	0	(7,912)
Gain on sale of marketable securities	0	230	2,467
Other income	488	780	250
Income before income taxes	23,741	43,832	2,608
Provision (benefit) for income taxes	(89,940)	6,782	392
NET INCOME	$ 113,681	$ 37,050	$ 2,216