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 |