Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue	$ 121,802	$ 101,867	$ 330,038	$ 294,186
Costs and expenses:
Direct operating expenses	55,201	48,778	161,690	146,433
Drydock expense	2,444	9,515	20,178	23,350
General and administrative expenses	13,522	14,389	41,217	38,501
Depreciation and amortization	16,252	14,697	46,447	44,576
Impairment charge		859		859
Gain on sale of assets	(6,001)	(3,919)	(5,875)	(8,744)
Total costs and expenses	81,418	84,319	263,657	244,975
Operating income	40,384	17,548	66,381	49,211
Other income (expense):
Interest expense	(5,106)	(4,331)	(16,749)	(18,036)
Interest income	34	64	129	229
Loss on extinguishment of debt		(187)		(3,828)
Foreign currency gain (loss) and other	(598)	539	(1,034)	(474)
Total other expense	(5,670)	(3,915)	(17,654)	(22,109)
Income before income taxes	34,714	13,633	48,727	27,102
Income tax provision	(2,425)	(627)	(3,711)	(2,941)
Net income	$ 32,289	$ 13,006	$ 45,016	$ 24,161
Earnings per share:
Basic (in Dollars per share)	$ 1.23	$ 0.49	$ 1.72	$ 0.92
Diluted (in Dollars per share)	$ 1.23	$ 0.49	$ 1.72	$ 0.92
Weighted average shares outstanding:
Basic (in Shares)	26,253	26,286	26,139	26,176
Diluted (in Shares)	26,271	26,294	26,149	26,201