Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Revenue	$ 178,492	$ 144,575	$ 360,459	$ 278,654
Costs and expenses
Operating expenses	156,497	128,127	310,140	238,020
Selling, general, and administrative expenses	6,948	6,464	14,968	13,645
Depreciation and amortization	3,646	3,236	6,966	6,636
Total costs and expenses	167,091	137,827	332,074	258,301
Operating income	11,401	6,748	28,385	20,353
Financial and other income (expense)
Interest expense	(2,412)	(2,346)	(4,865)	(5,294)
Accelerated amortization and other costs related to refinancing of senior debt				(3,046)
Equity in loss of unconsolidated investee	(1)		(38)
Financial instruments fair value adjustments	645	2,063	564	1,115
Other	15	(4)	28	(104)
Total financial and other income (expense)	(1,753)	(287)	(4,311)	(7,329)
Income before income taxes	9,648	6,461	24,074	13,024
Provision for federal and state income taxes	3,003	2,043	8,666	5,092
Net income	$ 6,645	$ 4,418	$ 15,408	$ 7,932
Earnings per common share:
Basic	$ 0.14	$ 0.10	$ 0.33	$ 0.17
Diluted	$ 0.14	$ 0.10	$ 0.33	$ 0.17
Weighted Average Common Shares Outstanding:
Basic	47,388,308	46,443,348	47,242,919	46,435,845
Diluted	47,541,787	46,463,537	47,395,769	46,476,453