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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 22,072 $ 26,975
Adjustments to reconcile net income to net cash provided by operating activities:    
Vessel depreciation and amortization (Note 4) 37,070 35,390
Amortization and write off of deferred financing costs 485 773
Amortization of above market acquired charters (Note 5) 7,744 7,060
Equity compensation expense (Note 9) 578 525
Changes in operating assets and liabilities:    
Trade accounts receivable net 358 (427)
Prepayments and other assets 351 (1,722)
Inventories 383 (897)
Trade accounts payable 3,511 2,271
Due to related parties (6,439) (8,387)
Accrued liabilities 468 (77)
Deferred revenue (3,206) (2,154)
Dry-docking costs paid (1,055) (1,826)
Net cash provided by operating activities 62,320 57,504
Cash flows from investing activities:    
Vessel acquisitions and improvements including time charter agreements (Note 4) (1,386) (74,038)
Increase in restricted cash 0 (500)
Net cash used in investing activities (1,386) (74,538)
Cash flows from financing activities:    
Proceeds from issuance of Partnership units (Note 8) 5,120 0
Expenses paid for issuance of Partnership units (120) 0
Proceeds from issuance of long-term debt 0 35,000
Deferred financing costs paid (14) (89)
Payments of long-term debt (Note 6) (8,677) (8,677)
Dividends paid (Note 8) (25,619) (44,142)
Net cash used in financing activities (29,310) (17,908)
Net increase / (decrease) in cash and cash equivalents 31,624 (34,942)
Cash and cash equivalents at beginning of period 106,678 90,190
Cash and cash equivalents at end of period 138,302 55,248
Supplemental Cash Flow Information    
Cash paid for interest 12,547 12,221
Non-Cash Investing and Financing Activities    
Offering expenses included in liabilities 113 0
Capital expenditures included in liabilities 941 613
Capitalized dry docking costs included in liabilities $ 86 $ 1,354