Long-Term Debt (Details) (USD $)
 0 Months Ended 1 Months Ended 7 Months Ended 12 Months Ended 1 Months Ended 20 Months Ended 1 Months Ended
Jan. 07, 2015
Dec. 23, 2014
Jan. 31, 2011
Aug. 31, 2010
Mar. 04, 2011
Dec. 31, 2014
Dec. 31, 2010
Dec. 31, 2013
Mar. 31, 2011
Mar. 04, 2011
Dec. 31, 2010
Jan. 24, 2011
Long-Term Debt                        
Long-term debt, including Comprehensive Financing Plan exit fee accrual and fair value of hedged debt           2,951,120,000   3,112,103,000        
Current portion           178,116,000   146,462,000        
Long-term portion           2,773,004,000   2,965,641,000        
Comprehensive Financing Plan exit fee accrued           11,862,000   8,117,000        
Fair value hedged debt           1,006,000   1,580,000        
Hyundai Samho Vendor Financing                        
Current portion           46,530,000   57,388,000        
Long-term portion           17,837,000   64,367,000        
Payment due by period ended                        
2015           178,116,000            
2016           268,467,000            
2017           294,041,000            
2018           2,136,608,000            
2019           20,340,000            
2020 and thereafter           40,680,000            
Total long-term debt           2,938,252,000            
Amendment fee paid 700,000 4,300,000                    
Fixed principal repayments                        
Payment due by period ended                        
2015           155,317,000            
2016           183,173,000            
2017           180,430,000            
2018           204,919,000            
2019           20,340,000            
2020 and thereafter           40,680,000            
Total long-term debt           784,859,000            
variable principal payments                        
Payment due by period ended                        
2015           22,799,000            
2016           85,294,000            
2017           113,611,000            
2018           68,008,000            
Total long-term debt           289,712,000            
Final Payment due on December 31, 2018*[and other payments thereafter]                        
Payment due by period ended                        
2018           1,863,681,000            
Total long-term debt           1,863,681,000            
Bank agreement                        
Payment due by period ended                        
Percentage of amendment fee paid and deferred     40.00% 20.00%                
Remaining percentage of amendment fee, which is due for payment on December 31, 2014           40.00%            
Commitment fee on undrawn committed debt designated for specific newbuildings (as a percent)         0.25%              
Previously Existing Credit Facilities                        
Payment due by period ended                        
Cumulative waiver fees as a percentage of existing financing commitments             0.20%          
Cumulative waiver fees paid     2,600,000                  
Amendment fee as a percentage of outstanding commitments       0.50%                
Amendment fee accrued under other long-term liabilities       12,500,000                
January 2011 Credit Facility                        
Payment due by period ended                        
Variable rate basis               LIBOR        
Interest rate added to variable rate basis (as a percent)           1.85%            
Commitment fee on undrawn committed debt designated for specific newbuildings (as a percent)           0.75%            
January 2011 Credit Facility | Bank agreement                        
Long-Term Debt                        
Long-term debt           633,016,506            
Payment due by period ended                        
2015           113,358,679            
2016           143,379,164            
2017           148,839,796            
2018           227,438,867            
Hyundai Samho vendor financing                        
Hyundai Samho Vendor Financing                        
Balance at the end of the period           64,367,000   121,755,000        
Current portion           46,530,000   57,388,000        
Long-term portion           17,837,000   64,367,000        
Payment due by period ended                        
2015           46,530,000            
2016           17,837,000            
Total long-term debt           64,367,000            
The Royal Bank of Scotland | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           678,954,000   683,614,000        
Current portion           12,657,000   4,628,000        
Long-term portion           666,297,000   678,986,000        
The Royal Bank of Scotland | January 2011 Credit Facility                        
Long-Term Debt                        
Long-term debt           85,017,000   94,245,000        
Current portion           15,326,000   9,226,000        
Long-term portion           69,691,000   85,019,000        
HSH Nordbank | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           28,843,000   31,163,000        
Current portion           7,633,000   2,545,000        
Long-term portion           21,210,000   28,618,000        
The Export-Import Bank of Korea (KEXIM) | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           18,573,000   28,942,000        
Current portion           10,369,000   10,369,000        
Long-term portion           8,204,000   18,573,000        
The Export-Import Bank of Korea & ABN Amro | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           56,859,000   68,109,000        
Current portion           11,250,000   11,250,000        
Long-term portion           45,609,000   56,859,000        
Payment due by period ended                        
Increase in interest rate margin (as a percent)           0.50%            
Deutsche Bank | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           174,709,000   177,968,000        
Current portion           4,786,000   3,251,000        
Long-term portion           169,923,000   174,717,000        
Credit Agricole | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           144,467,000   151,239,000        
Current portion           8,228,000   6,770,000        
Long-term portion           136,239,000   144,469,000        
Aegean Baltic Bank HSH Nordbank Piraeus Bank | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           628,513,000   658,160,000        
Current portion               11,447,000        
Long-term portion           628,513,000   646,713,000        
Payment due by period ended                        
Margin adjustment fee (as a percent)                   1.55%    
Margin adjustment fee settled in cash                 17,600,000      
Aegean Baltic Bank HSH Nordbank Piraeus Bank | January 2011 Credit Facility                        
Long-Term Debt                        
Long-term debt           94,812,000   110,396,000        
Current portion           22,476,000   15,503,000        
Long-term portion           72,336,000   94,893,000        
Credit Suisse | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           208,585,000   215,613,000        
Current portion           9,328,000   7,026,000        
Long-term portion           199,257,000   208,587,000        
ABN Amro-Lloyds TSB-National Bank of Greece | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           239,896,000   247,001,000        
Current portion           11,422,000   7,537,000        
Long-term portion           228,474,000   239,464,000        
ABN Amro-Lloyds TSB-National Bank of Greece | January 2011 Credit Facility                        
Long-Term Debt                        
Long-term debt           26,444,000   31,953,000        
Current portion           6,371,000   5,415,000        
Long-term portion           20,073,000   26,538,000        
Commerzbank-Credit Suisse- Credit Agricole | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           274,984,000   288,474,000        
Current portion           17,327,000   13,489,000        
Long-term portion           257,657,000   274,985,000        
Sinosure CEXIM-Citi-ABN Amro Credit Facility                        
Payment due by period ended                        
Variable rate basis               LIBOR        
Interest rate added to variable rate basis (as a percent)           2.85%            
Amendment fee accrued under other long-term liabilities       4,380,000                
Amendment fee paid     3,160,000               1,220,000  
Sinosure CEXIM-Citi-ABN Amro Credit Facility | Previously Existing Credit Facilities                        
Long-Term Debt                        
Long-term debt           142,380,000   162,720,000        
Current portion           20,340,000   20,340,000        
Long-term portion           122,040,000   142,380,000        
Club Facility | January 2011 Credit Facility                        
Long-Term Debt                        
Long-term debt           65,457,000   78,001,000        
Current portion           14,773,000   12,618,000        
Long-term portion           50,684,000   65,383,000        
Citibank and Eurobank | January 2011 Credit Facility                        
Long-Term Debt                        
Long-term debt           69,759,000   74,808,000        
Current portion           5,830,000   5,048,000        
Long-term portion           63,929,000   69,760,000        
Previously Existing Credit Facilities Except for KEXIM and KEXIM-ABN Amro                        
Payment due by period ended                        
New debt financing subject to bank agreement                       $ 425,000,000