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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Contributed Surplus [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive loss associated companies [Member]
Retained Earnings [Member]
Senior Unsecured Convertible Bonds Due 2018 [Member]
Additional Paid-in Capital [Member]
Senior Unsecured Convertible Bonds due 2023 [Member]
Additional Paid-in Capital [Member]
Starting Balance at Dec. 31, 2017 $ 1,194,997,000 $ 1,109,000 $ 403,659,000 $ 680,703,000 $ (94,612,000) $ 206,000 $ 203,932,000    
Starting Balance (in shares) at Dec. 31, 2017 110,930,873 110,930,873              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares issued (in shares) 8,442,191 8,442,191              
Shares issued $ 85,000 $ 85,000              
Amortization of stock based compensation 234,000   234,000            
Stock Granted, Value, Share-based Compensation, Forfeited 0   0            
Shares issued arising from conversion of 3.25% convertible bonds due 2018 9,927,000   9,927,000            
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments (9,933,000)   0         $ (9,933,000)  
Shares issued arising from consideration paid on vessel acquisitions 57,960,000   57,960,000            
Equity component of convertible bond issuance, net 7,905,000               $ 7,905,000
Gain/(loss) on hedging financial instruments reclassified into earnings 126,000       126,000        
Fair value adjustments to hedging financial instruments 9,480,000       9,119,000 361,000      
Reclassification of unrealized losses upon adoption of ASU 2016-01 | ASU 2016-01 [Member]         98,782,000   (98,782,000)    
Reclassification of unrealized losses upon adoption of ASU 2016-01 | ASU 2017-12 [Member] [Member]         0   0    
Fair value adjustments to available-for-sale securities 0       4,540,000        
Loss on marketable securities reclassified into earnings 4,540,000                
Other comprehensive income/(loss) (1,000)       (1,000)        
Net income 40,421,000           40,421,000    
Dividends declared $ (73,917,000)           (73,917,000)    
Ending Balance at Jun. 30, 2018   $ 1,194,000 469,752,000 680,703,000 17,954,000 567,000 71,654,000    
Ending Balance (in shares) at Jun. 30, 2018 119,373,064 119,373,064              
Starting Balance at Dec. 31, 2017 $ 1,194,997,000 $ 1,109,000 403,659,000 680,703,000 (94,612,000) 206,000 203,932,000    
Starting Balance (in shares) at Dec. 31, 2017 110,930,873 110,930,873              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares issued (in shares) 8,442,191 8,442,191              
Shares issued $ 85,000 $ 85,000              
Amortization of stock based compensation 454,000   454,000            
Stock Granted, Value, Share-based Compensation, Forfeited (33,000)   33,000            
Shares issued arising from conversion of 3.25% convertible bonds due 2018 9,927,000   9,927,000            
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments (11,029,000)   (1,096,000)         (9,933,000)  
Shares issued arising from consideration paid on vessel acquisitions 57,960,000   57,960,000            
Equity component of convertible bond issuance, net 7,905,000               7,906,000
Gain/(loss) on hedging financial instruments reclassified into earnings (3,127,000)       (3,127,000)        
Fair value adjustments to hedging financial instruments (3,639,000)       (3,433,000) (206,000)      
Reclassification of unrealized losses upon adoption of ASU 2016-01 | ASU 2016-01 [Member]         98,782,000   (98,782,000)    
Reclassification of unrealized losses upon adoption of ASU 2016-01 | ASU 2017-12 [Member] [Member]         0   0    
Fair value adjustments to available-for-sale securities 0       2,244,000        
Loss on marketable securities reclassified into earnings 2,244,000                
Other comprehensive income/(loss) (74,000)       (74,000)        
Net income 73,622,000           73,622,000    
Dividends declared (149,261,000)           (149,261,000)    
Ending Balance at Dec. 31, 2018 $ 1,180,032,000 $ 1,194,000 468,844,000 680,703,000 (220,000) 0 29,511,000    
Ending Balance (in shares) at Dec. 31, 2018 119,373,064 119,373,064              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares issued (in shares) 2,461 2,461              
Shares issued $ 0 $ 0              
Amortization of stock based compensation 409,000   409,000            
Stock Granted, Value, Share-based Compensation, Forfeited (49,000)   49,000            
Shares issued arising from conversion of 3.25% convertible bonds due 2018 0   0            
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments (231,000)   (231,000)         $ 0  
Shares issued arising from consideration paid on vessel acquisitions 0   0            
Equity component of convertible bond issuance, net 0               $ 0
Gain/(loss) on hedging financial instruments reclassified into earnings 0       0        
Fair value adjustments to hedging financial instruments (11,648,000)       (11,648,000) 0      
Reclassification of unrealized losses upon adoption of ASU 2016-01 | ASU 2016-01 [Member]         0   0    
Reclassification of unrealized losses upon adoption of ASU 2016-01 | ASU 2017-12 [Member] [Member]         (32,000)   32,000.0    
Fair value adjustments to available-for-sale securities 0       (296,000)        
Loss on marketable securities reclassified into earnings (296,000)                
Other comprehensive income/(loss) 22,000       22,000        
Net income 61,713,000           61,713,000    
Dividends declared (75,325,000)           (75,325,000)    
Ending Balance at Jun. 30, 2019 $ 1,154,627,000 $ 1,194,000 $ 468,973,000 $ 680,703,000 $ (12,174,000) $ 0 $ 15,931,000    
Ending Balance (in shares) at Jun. 30, 2019 119,375,525 119,375,525