Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue	$ 131,365	$ 111,348	$ 250,965	$ 208,236
Costs and expenses:
Direct operating expenses	59,724	53,352	116,023	106,489
Drydock expense	4,685	9,174	11,896	17,734
General and administrative expenses	17,403	16,745	31,892	27,695
Depreciation and amortization	19,204	15,025	37,561	30,195
Impairment charge	7,459		7,459
Loss on sale of assets		126		126
Total costs and expenses	108,475	94,422	204,831	182,239
Operating income	22,890	16,926	46,134	25,997
Interest expense	(7,422)	(5,262)	(14,162)	(11,643)
Interest income	15	38	30	95
Foreign currency loss and other	578	(949)	1,514	(436)
Total other expense	(6,829)	(6,173)	(12,618)	(11,984)
Income before income taxes	16,061	10,753	33,516	14,013
Income tax provision	(1,862)	(897)	(2,760)	(1,286)
Net income	$ 14,199	$ 9,856	$ 30,756	$ 12,727
Earnings per share:
Basic (in Dollars per share)	$ 0.54	$ 0.38	$ 1.17	$ 0.49
Diluted (in Dollars per share)	$ 0.54	$ 0.38	$ 1.17	$ 0.49
Weighted average shares outstanding:
Basic (in Shares)	26,425	26,120	26,389	26,082
Diluted (in Shares)	26,433	26,128	26,396	26,089