XML 19 R6.htm IDEA: XBRL DOCUMENT v3.6.0.2
Consolidated Statements of Capital - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance   $ 1,372,686   $ 1,381,097   $ 1,003,185 $ 1,372,686 $ 1,381,097 $ 1,003,185
Issuance of OP units, net of costs             611,206   379,328
Redemption of operating partnership units                 (829)
Equity component of senior unsecured notes                 13,204
Equity compensation             9,729 5,483 3,720
Distributions             (114,954) (91,900) (87,721)
Net income $ 33,008 $ 16,705 $ 19,370 $ 7,888 $ 10,964 $ 11,231 107,250 79,928 70,210
Unrealized loss on valuation of interest rate swap agreements             (3,054) (1,922) 0
Ending balance $ 1,982,863   $ 1,372,686   $ 1,381,097   $ 1,982,863 $ 1,372,686 $ 1,381,097
General Partner [Member] | Series PR Operating Partnership Units [Member]                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   120,023,000   107,191,000   95,606,000 120,023,000 107,191,000 95,606,000
Beginning balance   $ 524,729   $ 468,638   $ 385,158 $ 524,729 $ 468,638 $ 385,158
Issuance of OP units, net (in units)             29,611,000   2,666,000
Issuance of OP units, net of costs             $ 611,206   $ 44,398
Equity component of senior unsecured notes                 $ 4,857
Conversion of operating partnership units to shares (in units)             6,167,000 12,818,000 8,924,000
Conversion of operating partnership units to shares             $ 23,678 $ 62,070 $ 40,701
Equity compensation (in units)             40,000 14,000 (5,000)
Equity compensation             $ 357 $ 296 $ 455
Distributions             (55,812) (39,183) (33,598)
Net income             51,456 33,730 $ 26,667
Unrealized loss on valuation of interest rate swap agreements             $ (1,478) $ (822)  
Ending balance (in units) 155,841,000   120,023,000   107,191,000   155,841,000 120,023,000 107,191,000
Ending balance $ 1,154,136   $ 524,729   $ 468,638   $ 1,154,136 $ 524,729 $ 468,638
Limited Partner [Member] | Series PR Operating Partnership Units [Member]                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   93,863,000   100,211,000   84,589,000 93,863,000 100,211,000 84,589,000
Beginning balance   $ 809,901   $ 868,163   $ 571,763 $ 809,901 $ 868,163 $ 571,763
Issuance of OP units, net (in units)                 20,116,000
Issuance of OP units, net of costs                 $ 334,930
Issuance of private perpetual preferred units in exchange for OP units, (in units)                 (559,000)
Issuance of private perpetual preferred units in exchange for OP units                 $ (2,871)
Equity component of senior unsecured notes                 $ 5,172
Conversion of operating partnership units to shares (in units)             (2,657,000) (6,803,000) (4,406,000)
Conversion of operating partnership units to shares             $ (22,264) $ (58,636) $ (37,693)
Equity compensation (in units)             1,869,000 455,000 471,000
Equity compensation             $ 9,372 $ 5,187 $ 3,265
Distributions             (37,621) (32,794) (31,974)
Net income             34,977 28,678 $ 25,571
Unrealized loss on valuation of interest rate swap agreements             $ (1,005) $ (697)  
Ending balance (in units) 93,075,000   93,863,000   100,211,000   93,075,000 93,863,000 100,211,000
Ending balance $ 793,360   $ 809,901   $ 868,163   $ 793,360 $ 809,901 $ 868,163
Limited Partner [Member] | Series ES Operating Partnership Units [Member]                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   38,262,000   42,365,000   46,134,000 38,262,000 42,365,000 46,134,000
Beginning balance   $ 22,074   $ 26,488   $ 32,698 $ 22,074 $ 26,488 $ 32,698
Redemption of operating partnership units (in units)                 (39,000)
Redemption of operating partnership units                 $ (604)
Issuance of private perpetual preferred units in exchange for OP units, (in units)                 (529,000)
Issuance of private perpetual preferred units in exchange for OP units                 $ (2,714)
Equity component of senior unsecured notes                 $ 2,253
Conversion of operating partnership units to shares (in units)             (2,534,000) (4,103,000) (3,201,000)
Conversion of operating partnership units to shares             $ (1,075) $ (2,424) $ (2,185)
Distributions             (14,642) (13,495) (15,352)
Net income             14,140 11,792 $ 12,392
Unrealized loss on valuation of interest rate swap agreements             $ (406) $ (287)  
Ending balance (in units) 35,728,000   38,262,000   42,365,000   35,728,000 38,262,000 42,365,000
Ending balance $ 20,091   $ 22,074   $ 26,488   $ 20,091 $ 22,074 $ 26,488
Limited Partner [Member] | Series 60 Operating Partnership Units [Member]                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   10,318,000   11,546,000   12,570,000 10,318,000 11,546,000 12,570,000
Beginning balance   $ 5,366   $ 6,567   $ 8,866 $ 5,366 $ 6,567 $ 8,866
Redemption of operating partnership units (in units)                 (7,000)
Redemption of operating partnership units                 $ (109)
Issuance of private perpetual preferred units in exchange for OP units, (in units)                 (300,000)
Issuance of private perpetual preferred units in exchange for OP units                 $ (1,539)
Equity component of senior unsecured notes                 $ 606
Conversion of operating partnership units to shares (in units)             (617,000) (1,228,000) (717,000)
Conversion of operating partnership units to shares             $ (218) $ (654) $ (451)
Distributions             (3,985) (3,665) (4,167)
Net income             3,827 3,196 $ 3,361
Unrealized loss on valuation of interest rate swap agreements             $ (110) $ (78)  
Ending balance (in units) 9,701,000   10,318,000   11,546,000   9,701,000 10,318,000 11,546,000
Ending balance $ 4,880   $ 5,366   $ 6,567   $ 4,880 $ 5,366 $ 6,567
Limited Partner [Member] | Series 250 Operating Partnership Units [Member]                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   5,106,000   5,790,000   6,578,000 5,106,000 5,790,000 6,578,000
Beginning balance   $ 2,612   $ 3,237   $ 4,700 $ 2,612 $ 3,237 $ 4,700
Redemption of operating partnership units (in units)                 (7,000)
Redemption of operating partnership units                 $ (116)
Issuance of private perpetual preferred units in exchange for OP units, (in units)                 (172,000)
Issuance of private perpetual preferred units in exchange for OP units                 $ (880)
Equity component of senior unsecured notes                 $ 316
Conversion of operating partnership units to shares (in units)             (359,000) (684,000) (609,000)
Conversion of operating partnership units to shares             $ (121) $ (356) $ (372)
Distributions             (1,958) (1,827) (2,154)
Net income             1,914 1,596 $ 1,743
Unrealized loss on valuation of interest rate swap agreements             $ (55) $ (38)  
Ending balance (in units) 4,747,000   5,106,000   5,790,000   4,747,000 5,106,000 5,790,000
Ending balance $ 2,392   $ 2,612   $ 3,237   $ 2,392 $ 2,612 $ 3,237
Private Perpetual Preferred Units [Member]                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   1,560,000   1,560,000   0 1,560,000 1,560,000 0
Beginning balance   $ 8,004   $ 8,004   $ 0 $ 8,004 $ 8,004 $ 0
Issuance of private perpetual preferred units in exchange for OP units, (in units)                 (1,560,000)
Issuance of private perpetual preferred units in exchange for OP units                 $ 8,004
Distributions             (936) (936) (476)
Net income             936 936 $ 476
Unrealized loss on valuation of interest rate swap agreements             $ 0 $ 0  
Ending balance (in units) 1,560,000   1,560,000   1,560,000   1,560,000 1,560,000 1,560,000
Ending balance $ 8,004   $ 8,004   $ 8,004   $ 8,004 $ 8,004 $ 8,004