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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net (loss) income $ (36,383) $ 12,171
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:    
Depreciation and amortization 34,425 33,081
Amortization of deferred financing costs 980 778
Amortization of time charters acquired (186) (473)
Amortization of discount on Convertible Senior Notes 1,090 967
Unrealized gain on derivative instruments (27) (13)
Amortization of nonvested stock compensation expense 1,650 2,439
Change in assets and liabilities:    
Decrease in due from charterers 2,449 1,115
Increase in prepaid expenses and other current assets (2,878) (2,374)
Increase in other noncurrent assets   (514)
Decrease in accounts payable and accrued expenses (4,987) (2,965)
Decrease in deferred revenue (534) (3,372)
Increase (decrease) in lease obligations 398 (13)
Deferred drydock costs incurred (3,966) (675)
Net cash (used in) provided by operating activities (7,969) 40,152
Cash flows from investing activities:    
Purchase of vessels (319) (35,130)
Deposits on vessels   (78)
Purchase of other fixed assets (1,228) (66)
Changes in deposits of restricted cash   (750)
Net cash used in investing activities (1,547) (36,024)
Cash flows from financing activities:    
Repayments on the 2007 Credit Facility (12,500) (12,500)
Proceeds from issuance of common stock 50,721  
Payment of common stock issuance costs (632)  
Payment of Convertible Senior Notes issuance costs   (51)
Payment of dividend by subsidiary (2,212) (2,873)
Payment of deferred financing costs (147) (154)
Net cash provided by financing activities 28,231 461
Net increase in cash and cash equivalents 18,715 4,589
Cash and cash equivalents at beginning of period 227,968 270,877
Cash and cash equivalents at end of period 246,683 275,466
$100 Million Term Loan Facility
    
Cash flows from financing activities:    
Repayments on Term Loan Facility (1,924) (770)
$253 Million Term Loan Facility
    
Cash flows from financing activities:    
Repayments on Term Loan Facility (5,075) (4,691)
Proceeds from Term Loan Facility   $ 21,500