Long-Term Debt (Details 5) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
item
Jan. 24, 2011
Feb. 21, 2011
Long-Term Debt            
Exit fee recognized in long-term debt, net of current portion $ 11,862,000 $ 8,117,000        
Credit Facilities Summary Table            
Remaining borrowing availability 0          
Net income (3,920,000) 37,523,000 (105,204,000)      
Weighted average interest rate on long-term borrowings (as a percent) 2.50% 2.70% 2.70%      
Interest paid 83,000,000 92,900,000 90,000,000      
Interest cost incurred 80,000,000 91,200,000 91,000,000      
Interest expense recognized 79,980,000 91,185,000 87,340,000      
Interest capitalized 0 0 3,700,000      
January 2011 Credit Facility            
Credit Facilities Summary Table            
Aggregate exit fee payable on the common maturity date 25,000,000          
Outstanding Principal Amount 341,300,000          
Amount outstanding as of the balance sheet date 341,300,000          
The Royal Bank of Scotland | January 2011 Credit Facility            
Credit Facilities Summary Table            
Outstanding Principal Amount 85,000,000          
Amount outstanding as of the balance sheet date 85,000,000          
Maximum borrowing capacity under credit facility         100,000,000  
The Royal Bank of Scotland | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 679,000,000          
Amount outstanding as of the balance sheet date 679,000,000          
Aegean Baltic Bank HSH Nordbank Piraeus Bank | January 2011 Credit Facility            
Credit Facilities Summary Table            
Outstanding Principal Amount 94,800,000       23,750,000  
Amount outstanding as of the balance sheet date 94,800,000       23,750,000  
Maximum borrowing capacity under credit facility         123,800,000  
Aegean Baltic Bank HSH Nordbank Piraeus Bank | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 628,500,000          
Amount outstanding as of the balance sheet date 628,500,000          
Credit Agricole | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 144,500,000          
Amount outstanding as of the balance sheet date 144,500,000          
Deutsche Bank | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 174,700,000          
Amount outstanding as of the balance sheet date 174,700,000          
Credit Suisse | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 208,600,000          
Amount outstanding as of the balance sheet date 208,600,000          
ABN Amro-Lloyds TSB-National Bank of Greece            
Credit Facilities Summary Table            
Maximum borrowing capacity under credit facility       253,200,000    
Number of subsidiaries which issued put option in respect of preference shares       4    
ABN Amro-Lloyds TSB-National Bank of Greece | January 2011 Credit Facility            
Credit Facilities Summary Table            
Maximum borrowing capacity under credit facility         37,100,000  
ABN Amro-Lloyds TSB-National Bank of Greece | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 239,900,000          
Amount outstanding as of the balance sheet date 239,900,000          
Commerzbank-Credit Suisse- Credit Agricole | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 275,000,000          
Amount outstanding as of the balance sheet date 275,000,000          
HSH Nordbank | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 28,800,000          
Amount outstanding as of the balance sheet date 28,800,000          
The Export-Import Bank of Korea (KEXIM) | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 18,600,000          
Amount outstanding as of the balance sheet date 18,600,000          
The Export-Import Bank of Korea & ABN Amro | Previously Existing Credit Facilities            
Credit Facilities Summary Table            
Outstanding Principal Amount 56,900,000          
Amount outstanding as of the balance sheet date 56,900,000          
Club Facility | January 2011 Credit Facility            
Credit Facilities Summary Table            
Outstanding Principal Amount 65,400,000          
Amount outstanding as of the balance sheet date 65,400,000          
Maximum borrowing capacity under credit facility         83,900,000  
Citibank and Eurobank | January 2011 Credit Facility            
Credit Facilities Summary Table            
Outstanding Principal Amount 69,700,000          
Amount outstanding as of the balance sheet date 69,700,000          
Maximum borrowing capacity under credit facility         80,000,000  
Sinosure CEXIM-Citi-ABN Amro Credit Facility            
Credit Facilities Summary Table            
Outstanding Principal Amount 142,400,000          
Amount outstanding as of the balance sheet date 142,400,000          
Remaining borrowing availability 0          
Maximum borrowing capacity under credit facility           203,400,000
Sinosure CEXIM-Citi-ABN Amro Credit Facility | January 2011 Credit Facility            
Credit Facilities Summary Table            
Outstanding Principal Amount 142,400,000          
Amount outstanding as of the balance sheet date 142,400,000          
Hyundai Samho Vendor            
Credit Facilities Summary Table            
Outstanding Principal Amount 64,400,000          
Amount outstanding as of the balance sheet date 64,400,000          
ABN Amro Club Facility | January 2011 Credit Facility            
Credit Facilities Summary Table            
Outstanding Principal Amount 26,400,000          
Amount outstanding as of the balance sheet date 26,400,000          
Investor Bank            
Credit Facilities Summary Table            
Net assets 0          
Net income $ 0