Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$ 128,686	$ 121,802	$ 379,651	$ 330,038
Costs and expenses:
Direct operating expenses	62,230	55,201	178,253	161,690
Drydock expense	4,353	2,444	16,249	20,178
General and administrative expenses	15,021	13,522	46,913	41,217
Depreciation and amortization	19,168	16,252	56,729	46,447
Impairment charge			7,459
Gain on sale of assets and other	(6,877)	(6,001)	(6,877)	(5,875)
Total costs and expenses	93,895	81,418	298,726	263,657
Operating income	34,791	40,384	80,925	66,381
Interest expense	(7,840)	(5,106)	(22,002)	(16,749)
Interest income	49	34	79	129
Foreign currency loss and other	(1,859)	(598)	(345)	(1,034)
Total other expense	(9,650)	(5,670)	(22,268)	(17,654)
Income before income taxes	25,141	34,714	58,657	48,727
Income tax provision	(797)	(2,425)	(3,557)	(3,711)
Net income	$ 24,344	$ 32,289	$ 55,100	$ 45,016
Earnings per share:
Basic (in Dollars per share)	$ 0.92	$ 1.23	$ 2.09	$ 1.72
Diluted (in Dollars per share)	$ 0.92	$ 1.23	$ 2.09	$ 1.72
Weighted average shares outstanding:
Basic (in Shares)	26,390	26,253	26,389	26,139
Diluted (in Shares)	26,390	26,271	26,394	26,149