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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Change in Noncontrolling Interest (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Beginning Balance       $ 648,440         $ 648,440    
Net income (loss) $ (6,671) $ (2,597) $ (2,270) (4,160) $ 24,944 $ 13,285 $ 6,108 $ 19,971 (15,698) $ 64,308 $ 134,592
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership                 0 0 0
Issuance of Common and Preferred OP Units to acquire real estate                     31,429
Acquisition of noncontrolling interest                     (18,379)
Other comprehensive loss - unrealized loss on valuation of swap agreements                 (2,659) 634 (646)
Change in control of previously unconsolidated investment                     (75,713)
Reclassification of realized interest on swap agreements                 71 3,317 4,576
Noncontrolling interest contributions                 47,560 85,206 295,108
Noncontrolling interest distributions                 (24,793) (32,805) (80,769)
Employee Long-term Incentive Plan Unit Awards                 12,948 11,155 13,694
Rebalancing adjustment                 0 0 0
Ending Balance 622,442       648,440       622,442 648,440  
Noncontrolling Interests                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Beginning Balance       648,440       589,548 648,440 589,548 420,866
Distributions declared of $1.09,1.05 and $1.16 per Common OP Unit for year ended 2018,2017 and 2016, respectively                 (6,888) (6,453) (6,753)
Net income (loss)                 (47,137) 2,838 61,816
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership                 (2,068) (1,541) (7,892)
Issuance of Common and Preferred OP Units to acquire real estate                     31,429
Acquisition of noncontrolling interest                     (25,925)
Other comprehensive loss - unrealized loss on valuation of swap agreements                 (810) (147) (332)
Change in control of previously unconsolidated investment                     (75,713)
Reclassification of realized interest on swap agreements                 320 686 597
Noncontrolling interest contributions                 47,560 85,206 295,108
Noncontrolling interest distributions                 (24,793) (32,805) (80,769)
Employee Long-term Incentive Plan Unit Awards                 12,374 10,457 12,768
Rebalancing adjustment                 (4,556) 651 (35,652)
Ending Balance 622,442       648,440       622,442 648,440 589,548
Noncontrolling Interests | Restatement Adjustment                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Ending Balance (4,556)               (4,556)    
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Beginning Balance       545,519       494,126 545,519 494,126 324,526
Distributions declared of $1.09,1.05 and $1.16 per Common OP Unit for year ended 2018,2017 and 2016, respectively                 0 0 0
Net income (loss)                 (49,709) (1,321) 56,814
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership                 0 0 0
Issuance of Common and Preferred OP Units to acquire real estate                     0
Acquisition of noncontrolling interest                     (25,925)
Other comprehensive loss - unrealized loss on valuation of swap agreements                 (681) (232) (289)
Change in control of previously unconsolidated investment                     (75,713)
Reclassification of realized interest on swap agreements                 323 545 374
Noncontrolling interest contributions                 47,560 85,206 295,108
Noncontrolling interest distributions                 (24,793) (32,805) (80,769)
Employee Long-term Incentive Plan Unit Awards                 0 0 0
Rebalancing adjustment                     0
Ending Balance 518,219       545,519       518,219 545,519 494,126
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates | Restatement Adjustment                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Ending Balance 0               0    
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Beginning Balance       $ 102,921       $ 95,422 102,921 95,422 96,340
Distributions declared of $1.09,1.05 and $1.16 per Common OP Unit for year ended 2018,2017 and 2016, respectively                 (6,888) (6,453) (6,753)
Net income (loss)                 2,572 4,159 5,002
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership                 (2,068) (1,541) (7,892)
Issuance of Common and Preferred OP Units to acquire real estate                     31,429
Acquisition of noncontrolling interest                     0
Other comprehensive loss - unrealized loss on valuation of swap agreements                 (129) 85 (43)
Change in control of previously unconsolidated investment                     0
Reclassification of realized interest on swap agreements                 (3) 141 223
Noncontrolling interest contributions                 0 0 0
Noncontrolling interest distributions                 0 0 0
Employee Long-term Incentive Plan Unit Awards                 12,374 10,457 12,768
Rebalancing adjustment                 (4,556) 651 (35,652)
Ending Balance 104,223       $ 102,921       104,223 $ 102,921 $ 95,422
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Restatement Adjustment                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Ending Balance $ (4,556)               $ (4,556)