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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 |  |  |  |  |  |  |

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