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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 38,483 $ 52,489 $ 55,410
Adjustments to reconcile net income to net cash provided by operating activities:      
Vessel depreciation and amortization (Note 5) 73,993 71,897 62,707
Amortization and write off of deferred financing costs 1,262 1,250 908
Amortization of above market acquired charters (Note 6) 15,208 14,542 14,864
Equity compensation expense (Note 13) 1,156 1,074 34
Impairment of vessel (Notes 5, 8) 3,282 0 0
Changes in operating assets and liabilities:      
Trade accounts receivable (2,275) 183 (92)
Due from related parties 0 0 55
Prepayments and other assets 486 (600) (2,102)
Inventories (719) (354) (973)
Trade accounts payable 2,764 (595) 1,929
Due to related parties (1,861) (6,059) 4,657
Accrued liabilities 7,624 662 1,114
Deferred revenue (11,299) 24,267 (2,207)
Dry docking costs paid (1,130) (3,670) (2,095)
Net cash provided by operating activities 126,974 155,086 134,209
Cash flows from investing activities:      
Vessel acquisitions and improvements including time charter agreements (Notes 5, 6) (2,038) (90,782) (207,937)
Increase in restricted cash 0 (1,000) (2,000)
Net cash used in investing activities (2,038) (91,782) (209,937)
Cash flows from financing activities:      
Proceeds from issuance of Partnership units (Note 12) 17,815 4,546 133,327
Expenses paid for issuance of Partnership units (247) (784) (739)
Proceeds from issuance of long-term debt (Note 7) 0 35,000 115,000
Payments of long-term debt (Note 7) (129,262) (17,354) (121,299)
Deferred financing costs paid (4,993) (31) (1,797)
Dividends paid (Note 12) (51,630) (68,193) (122,773)
Net cash (used in) / provided by financing activities (168,317) (46,816) 1,719
Net (decrease) / increase in cash and cash equivalents (43,381) 16,488 (74,009)
Cash and cash equivalents at the beginning of the year 106,678 90,190 164,199
Cash and cash equivalents at the end of the year 63,297 106,678 90,190
Supplemental Cash Flow Information      
Cash paid for interest 19,646 23,763 16,759
Non-Cash Investing and Financing Activities      
Capital expenditures included in liabilities 312 1,383 769
Offering expenses included in liabilities 35 106 0
Deferred financing costs included in liabilities 79 0 0
Capitalized dry docking costs included in liabilities 11 1,141 1,687
Assumption of loan regarding the acquisition of the shares of Filonikis Product Carrier S.A. (''Filonikis'') (Notes 3, 7) 0 15,750 0
Units issued to acquire Filonikis (Note 3) $ 0 $ 911 $ 0