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Consolidated Statements of Changes in Partners' Capital - USD ($)
$ in Thousands
Total
General Partner
Common Unitholders
Preferred Unitholders
Balance at Dec. 31, 2014 $ 872,561 $ 15,602 $ 735,547 $ 121,412
Distributions declared and paid (distributions of $0.94 in 2015, $0.46 in 2016 and $0.32 in 2017 per common unit, $0.87 in 2015, $0.86 in 2016 and $0.86 in 2017 per preferred unit) (Note 12) (122,773) (2,225) (109,027) (11,521)
Partnership's net income 55,410 879 43,197 11,334
Issuance of Partnership's units (Note 12) 132,588   132,588  
Equity compensation expense (Note 13) 34   34  
Conversion of Partnership's units (Note 12)   2,742 7,900 (10,642)
Balance at Dec. 31, 2015 937,820 16,998 810,239 110,583
Distributions declared and paid (distributions of $0.94 in 2015, $0.46 in 2016 and $0.32 in 2017 per common unit, $0.87 in 2015, $0.86 in 2016 and $0.86 in 2017 per preferred unit) (Note 12) (68,193) (1,131) (55,884) (11,178)
Partnership's net income 52,489 818 40,570 11,101
Issuance of Partnership's units (Note 12) 4,567   4,567  
Equity compensation expense (Note 13) 1,074   1,074  
Balance at Dec. 31, 2016 927,757 16,685 800,566 110,506
Distributions declared and paid (distributions of $0.94 in 2015, $0.46 in 2016 and $0.32 in 2017 per common unit, $0.87 in 2015, $0.86 in 2016 and $0.86 in 2017 per preferred unit) (Note 12) (51,630) (780) (39,749) (11,101)
Partnership's net income 38,483 522 26,860 11,101
Issuance of Partnership's units (Note 12) 17,639   17,639  
Equity compensation expense (Note 13) 1,156   1,156  
Balance at Dec. 31, 2017 $ 933,405 $ 16,427 $ 806,472 $ 110,506