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Basis of Presentation and Summary of Significant Accounting Policies - Noncontrolling Interests (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Balance, beginning of year $ 692 $ 773 $ 3,364
Net income allocable to noncontrolling interests, excluding redeemable noncontrolling interests 2,014 1,933 2,198
Distributions to noncontrolling interests 0 (252) (115)
Acquisition of partner's interest in Beacon Hill operating property 0 0 (2,353)
Partner's share of loss on sale of Cornelius Gateway operating property 0 0 (234)
Balance, end of year 698 692 773
Excluding Redeemable Non-Controlling Interests      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Net income allocable to noncontrolling interests, excluding redeemable noncontrolling interests $ 6 $ 171 $ 111