Schedule III - Real Estate and Accumulated Depreciation (Details) - Real Estate and Accumulated Depreciation - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate Properties [Line Items]
Encumbrances	$ 86,708
Initial Cost to Company, Land	892,736
Initial Cost to Company, Buildings & Improvements	2,059,275
Cost Capitalized Subsequent to Acquisition, Land	1,504
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	206,957
Amount at Which Carried at Close of Period. Land	894,240
Amount at Which Carried at Close of Period, Buildings & Improvements	2,266,232
Total real estate investments	3,160,472	$ 3,109,397	$ 2,687,018	$ 2,296,617
Accumulated Depreciation	329,207
Paramount Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,347
Initial Cost to Company, Buildings & Improvements	10,274
Cost Capitalized Subsequent to Acquisition, Land	447
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,227
Amount at Which Carried at Close of Period. Land	6,794
Amount at Which Carried at Close of Period, Buildings & Improvements	12,501
Total real estate investments	19,295
Accumulated Depreciation	$ 3,571
Date of Acquisition	Dec. 22, 2009
Santa Ana Downtown Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,895
Initial Cost to Company, Buildings & Improvements	9,890
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,856
Amount at Which Carried at Close of Period. Land	7,895
Amount at Which Carried at Close of Period, Buildings & Improvements	13,746
Total real estate investments	21,641
Accumulated Depreciation	$ 3,281
Date of Acquisition	Jan. 26, 2010
Meridian Valley Plaza, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,881
Initial Cost to Company, Buildings & Improvements	4,795
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,724
Amount at Which Carried at Close of Period. Land	1,881
Amount at Which Carried at Close of Period, Buildings & Improvements	6,519
Total real estate investments	8,400
Accumulated Depreciation	$ 1,696
Date of Acquisition	Feb. 01, 2010
The Market at Lake Stevens, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,087
Initial Cost to Company, Buildings & Improvements	12,397
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	408
Amount at Which Carried at Close of Period. Land	3,087
Amount at Which Carried at Close of Period, Buildings & Improvements	12,805
Total real estate investments	15,892
Accumulated Depreciation	$ 3,394
Date of Acquisition	Mar. 16, 2010
Norwood Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,031
Initial Cost to Company, Buildings & Improvements	11,534
Cost Capitalized Subsequent to Acquisition, Land	122
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,253
Amount at Which Carried at Close of Period. Land	3,153
Amount at Which Carried at Close of Period, Buildings & Improvements	12,787
Total real estate investments	15,940
Accumulated Depreciation	$ 3,419
Date of Acquisition	Apr. 05, 2010
Pleasant Hill Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,359
Initial Cost to Company, Buildings & Improvements	6,927
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,590
Amount at Which Carried at Close of Period. Land	6,359
Amount at Which Carried at Close of Period, Buildings & Improvements	8,517
Total real estate investments	14,876
Accumulated Depreciation	$ 2,396
Date of Acquisition	Apr. 08, 2010
Vancouver Market Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,080
Initial Cost to Company, Buildings & Improvements	6,912
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,981
Amount at Which Carried at Close of Period. Land	4,080
Amount at Which Carried at Close of Period, Buildings & Improvements	10,893
Total real estate investments	14,973
Accumulated Depreciation	$ 2,356
Date of Acquisition	Jun. 17, 2010
Happy Valley Town Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 11,678
Initial Cost to Company, Buildings & Improvements	27,011
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,564
Amount at Which Carried at Close of Period. Land	11,678
Amount at Which Carried at Close of Period, Buildings & Improvements	29,575
Total real estate investments	41,253
Accumulated Depreciation	$ 7,539
Date of Acquisition	Jul. 14, 2010
Cascade Summit Town Square, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,853
Initial Cost to Company, Buildings & Improvements	7,732
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	421
Amount at Which Carried at Close of Period. Land	8,853
Amount at Which Carried at Close of Period, Buildings & Improvements	8,153
Total real estate investments	17,006
Accumulated Depreciation	$ 2,595
Date of Acquisition	Aug. 20, 2010
Heritage Market Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,595
Initial Cost to Company, Buildings & Improvements	17,399
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	771
Amount at Which Carried at Close of Period. Land	6,595
Amount at Which Carried at Close of Period, Buildings & Improvements	18,170
Total real estate investments	24,765
Accumulated Depreciation	$ 4,442
Date of Acquisition	Sep. 23, 2010
Claremont Promenade, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,975
Initial Cost to Company, Buildings & Improvements	1,019
Cost Capitalized Subsequent to Acquisition, Land	183
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,402
Amount at Which Carried at Close of Period. Land	6,158
Amount at Which Carried at Close of Period, Buildings & Improvements	5,421
Total real estate investments	11,579
Accumulated Depreciation	$ 2,383
Date of Acquisition	Sep. 23, 2010
Sycamore Creek, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,747
Initial Cost to Company, Buildings & Improvements	11,584
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	582
Amount at Which Carried at Close of Period. Land	3,747
Amount at Which Carried at Close of Period, Buildings & Improvements	12,166
Total real estate investments	15,913
Accumulated Depreciation	$ 3,572
Date of Acquisition	Sep. 30, 2010
Gateway Village, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,917
Initial Cost to Company, Buildings & Improvements	27,298
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	989
Amount at Which Carried at Close of Period. Land	5,917
Amount at Which Carried at Close of Period, Buildings & Improvements	28,287
Total real estate investments	34,204
Accumulated Depreciation	$ 6,624
Date of Acquisition	Dec. 16, 2010
Division Crossing, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,706
Initial Cost to Company, Buildings & Improvements	8,327
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	5,700
Amount at Which Carried at Close of Period. Land	3,706
Amount at Which Carried at Close of Period, Buildings & Improvements	14,027
Total real estate investments	17,733
Accumulated Depreciation	$ 3,980
Date of Acquisition	Dec. 22, 2010
Halsey Crossing, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Buildings & Improvements	$ 7,773
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	7,690
Amount at Which Carried at Close of Period, Buildings & Improvements	15,463
Total real estate investments	15,463
Accumulated Depreciation	$ 2,914
Date of Acquisition	Dec. 22, 2010
Marketplace Del Rio,CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 13,420
Initial Cost to Company, Buildings & Improvements	22,251
Cost Capitalized Subsequent to Acquisition, Land	9
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,462
Amount at Which Carried at Close of Period. Land	13,429
Amount at Which Carried at Close of Period, Buildings & Improvements	24,713
Total real estate investments	38,142
Accumulated Depreciation	$ 6,357
Date of Acquisition	Jan. 03, 2011
Pinole Vista Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 12,894
Initial Cost to Company, Buildings & Improvements	35,689
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,247
Amount at Which Carried at Close of Period. Land	12,894
Amount at Which Carried at Close of Period, Buildings & Improvements	39,936
Total real estate investments	52,830
Accumulated Depreciation	6,424
Desert Springs Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	8,517
Initial Cost to Company, Buildings & Improvements	18,761
Cost Capitalized Subsequent to Acquisition, Land	443
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	6,568
Amount at Which Carried at Close of Period. Land	8,960
Amount at Which Carried at Close of Period, Buildings & Improvements	25,329
Total real estate investments	34,289
Accumulated Depreciation	$ 5,693
Date of Acquisition	Feb. 17, 2011
Mills Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,084
Initial Cost to Company, Buildings & Improvements	16,833
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	11,693
Amount at Which Carried at Close of Period. Land	4,084
Amount at Which Carried at Close of Period, Buildings & Improvements	28,526
Total real estate investments	32,610
Accumulated Depreciation	$ 8,137
Date of Acquisition	Feb. 17, 2011
Morada Ranch, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 2,504
Initial Cost to Company, Buildings & Improvements	19,547
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	791
Amount at Which Carried at Close of Period. Land	2,504
Amount at Which Carried at Close of Period, Buildings & Improvements	20,338
Total real estate investments	22,842
Accumulated Depreciation	$ 4,717
Date of Acquisition	May 20, 2011
Renaissance Towne Centre, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,640
Initial Cost to Company, Buildings & Improvements	13,848
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,667
Amount at Which Carried at Close of Period. Land	8,640
Amount at Which Carried at Close of Period, Buildings & Improvements	15,515
Total real estate investments	24,155
Accumulated Depreciation	$ 2,987
Date of Acquisition	Aug. 03, 2011
Country Club Gate Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,487
Initial Cost to Company, Buildings & Improvements	17,341
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,208
Amount at Which Carried at Close of Period. Land	6,487
Amount at Which Carried at Close of Period, Buildings & Improvements	18,549
Total real estate investments	25,036
Accumulated Depreciation	$ 4,403
Date of Acquisition	Jul. 08, 2011
Canyon Park Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,352
Initial Cost to Company, Buildings & Improvements	15,916
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8,757
Amount at Which Carried at Close of Period. Land	9,352
Amount at Which Carried at Close of Period, Buildings & Improvements	24,673
Total real estate investments	34,025
Accumulated Depreciation	$ 5,284
Date of Acquisition	Jul. 29, 2011
Hawks Prairie Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,334
Initial Cost to Company, Buildings & Improvements	20,694
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,224
Amount at Which Carried at Close of Period. Land	5,334
Amount at Which Carried at Close of Period, Buildings & Improvements	22,918
Total real estate investments	28,252
Accumulated Depreciation	$ 4,657
Date of Acquisition	Sep. 08, 2011
The Kress Building, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,693
Initial Cost to Company, Buildings & Improvements	20,866
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,825
Amount at Which Carried at Close of Period. Land	5,693
Amount at Which Carried at Close of Period, Buildings & Improvements	25,691
Total real estate investments	31,384
Accumulated Depreciation	$ 6,179
Date of Acquisition	Sep. 30, 2011
Hillsboro Market Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Buildings & Improvements	$ 17,553
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,493
Amount at Which Carried at Close of Period, Buildings & Improvements	21,046
Total real estate investments	21,046
Accumulated Depreciation	$ 4,295
Date of Acquisition	Nov. 23, 2011
Gateway Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,242
Initial Cost to Company, Buildings & Improvements	23,462
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8
Amount at Which Carried at Close of Period. Land	6,242
Amount at Which Carried at Close of Period, Buildings & Improvements	23,470
Total real estate investments	29,712
Accumulated Depreciation	$ 4,582
Date of Acquisition	Feb. 16, 2012
Euclid Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,407
Initial Cost to Company, Buildings & Improvements	7,753
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,905
Amount at Which Carried at Close of Period. Land	7,407
Amount at Which Carried at Close of Period, Buildings & Improvements	10,658
Total real estate investments	18,065
Accumulated Depreciation	$ 2,954
Date of Acquisition	Mar. 28, 2012
Green Valley Station, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,685
Initial Cost to Company, Buildings & Improvements	8,999
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	591
Amount at Which Carried at Close of Period. Land	1,685
Amount at Which Carried at Close of Period, Buildings & Improvements	9,590
Total real estate investments	11,275
Accumulated Depreciation	$ 2,292
Date of Acquisition	Apr. 02, 2012
Aurora Square, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,325
Initial Cost to Company, Buildings & Improvements	13,336
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,906
Amount at Which Carried at Close of Period. Land	10,325
Amount at Which Carried at Close of Period, Buildings & Improvements	15,242
Total real estate investments	25,567
Accumulated Depreciation	2,220
Marlin Cove Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	8,815
Initial Cost to Company, Buildings & Improvements	6,797
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,084
Amount at Which Carried at Close of Period. Land	8,815
Amount at Which Carried at Close of Period, Buildings & Improvements	8,881
Total real estate investments	17,696
Accumulated Depreciation	$ 2,212
Date of Acquisition	May 04, 2012
Seabridge Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,098
Initial Cost to Company, Buildings & Improvements	17,164
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,482
Amount at Which Carried at Close of Period. Land	5,098
Amount at Which Carried at Close of Period, Buildings & Improvements	20,646
Total real estate investments	25,744
Accumulated Depreciation	$ 3,798
Date of Acquisition	May 31, 2012
The Village at Novato, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,329
Initial Cost to Company, Buildings & Improvements	4,412
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,550
Amount at Which Carried at Close of Period. Land	5,329
Amount at Which Carried at Close of Period, Buildings & Improvements	5,962
Total real estate investments	11,291
Accumulated Depreciation	$ 1,044
Date of Acquisition	Jul. 24, 2012
Glendora Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,847
Initial Cost to Company, Buildings & Improvements	8,758
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	211
Amount at Which Carried at Close of Period. Land	5,847
Amount at Which Carried at Close of Period, Buildings & Improvements	8,969
Total real estate investments	14,816
Accumulated Depreciation	$ 2,062
Date of Acquisition	Aug. 01, 2012
Wilsonville Old Town Square, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,181
Initial Cost to Company, Buildings & Improvements	15,394
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	509
Amount at Which Carried at Close of Period. Land	4,181
Amount at Which Carried at Close of Period, Buildings & Improvements	15,903
Total real estate investments	20,084
Accumulated Depreciation	$ 3,122
Date of Acquisition	Aug. 01, 2012
Bay Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,454
Initial Cost to Company, Buildings & Improvements	14,857
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,096
Amount at Which Carried at Close of Period. Land	5,454
Amount at Which Carried at Close of Period, Buildings & Improvements	15,953
Total real estate investments	21,407
Accumulated Depreciation	$ 3,161
Date of Acquisition	Oct. 05, 2012
Santa Teresa Village, CA
Real Estate Properties [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land	14,965
Initial Cost to Company, Buildings & Improvements	17,162
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	5,539
Amount at Which Carried at Close of Period. Land	14,965
Amount at Which Carried at Close of Period, Buildings & Improvements	22,701
Total real estate investments	37,666
Accumulated Depreciation	$ 4,819
Date of Acquisition	Nov. 08, 2012
Cypress Center West, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 15,480
Initial Cost to Company, Buildings & Improvements	11,819
Cost Capitalized Subsequent to Acquisition, Land	121
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,065
Amount at Which Carried at Close of Period. Land	15,601
Amount at Which Carried at Close of Period, Buildings & Improvements	13,884
Total real estate investments	29,485
Accumulated Depreciation	$ 3,129
Date of Acquisition	Dec. 07, 2012
Redondo Beach Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,242
Initial Cost to Company, Buildings & Improvements	13,625
Cost Capitalized Subsequent to Acquisition, Land	55
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	217
Amount at Which Carried at Close of Period. Land	16,297
Amount at Which Carried at Close of Period, Buildings & Improvements	13,842
Total real estate investments	30,139
Accumulated Depreciation	$ 2,659
Date of Acquisition	Dec. 28, 2012
Harbor Place Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,506
Initial Cost to Company, Buildings & Improvements	10,527
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	289
Amount at Which Carried at Close of Period. Land	16,506
Amount at Which Carried at Close of Period, Buildings & Improvements	10,816
Total real estate investments	27,322
Accumulated Depreciation	$ 1,932
Date of Acquisition	Dec. 28, 2012
Diamond Bar Town Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,540
Initial Cost to Company, Buildings & Improvements	16,795
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,542
Amount at Which Carried at Close of Period. Land	9,540
Amount at Which Carried at Close of Period, Buildings & Improvements	20,337
Total real estate investments	29,877
Accumulated Depreciation	$ 4,662
Date of Acquisition	Feb. 01, 2013
Bernardo Heights Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,192
Initial Cost to Company, Buildings & Improvements	8,940
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	727
Amount at Which Carried at Close of Period. Land	3,192
Amount at Which Carried at Close of Period, Buildings & Improvements	9,667
Total real estate investments	12,859
Accumulated Depreciation	$ 1,869
Date of Acquisition	Feb. 06, 2013
Canyon Crossing, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,941
Initial Cost to Company, Buildings & Improvements	24,659
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,946
Amount at Which Carried at Close of Period. Land	7,941
Amount at Which Carried at Close of Period, Buildings & Improvements	27,605
Total real estate investments	35,546
Accumulated Depreciation	$ 5,808
Date of Acquisition	Apr. 15, 2013
Diamond Hills Plaza, CA
Real Estate Properties [Line Items]
Encumbrances	$ 35,500
Initial Cost to Company, Land	15,458
Initial Cost to Company, Buildings & Improvements	29,353
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	357
Amount at Which Carried at Close of Period. Land	15,458
Amount at Which Carried at Close of Period, Buildings & Improvements	29,710
Total real estate investments	45,168
Accumulated Depreciation	$ 5,310
Date of Acquisition	Apr. 22, 2013
Granada Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,673
Initial Cost to Company, Buildings & Improvements	13,459
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	491
Amount at Which Carried at Close of Period. Land	3,673
Amount at Which Carried at Close of Period, Buildings & Improvements	13,950
Total real estate investments	17,623
Accumulated Depreciation	$ 2,536
Date of Acquisition	Jun. 27, 2013
Hawthorne Crossings, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,383
Initial Cost to Company, Buildings & Improvements	29,277
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	127
Amount at Which Carried at Close of Period. Land	10,383
Amount at Which Carried at Close of Period, Buildings & Improvements	29,404
Total real estate investments	39,787
Accumulated Depreciation	$ 4,805
Date of Acquisition	Jun. 27, 2013
Robinwood Shopping Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,997
Initial Cost to Company, Buildings & Improvements	11,317
Cost Capitalized Subsequent to Acquisition, Land	18
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,064
Amount at Which Carried at Close of Period. Land	4,015
Amount at Which Carried at Close of Period, Buildings & Improvements	12,381
Total real estate investments	16,396
Accumulated Depreciation	$ 2,278
Date of Acquisition	Aug. 23, 2013
5 Points Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 17,920
Initial Cost to Company, Buildings & Improvements	36,965
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,082
Amount at Which Carried at Close of Period. Land	17,920
Amount at Which Carried at Close of Period, Buildings & Improvements	41,047
Total real estate investments	58,967
Accumulated Depreciation	$ 6,358
Date of Acquisition	Sep. 27, 2013
Crossroads Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 68,366
Initial Cost to Company, Buildings & Improvements	67,756
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	17,984
Amount at Which Carried at Close of Period. Land	68,366
Amount at Which Carried at Close of Period, Buildings & Improvements	85,740
Total real estate investments	154,106
Accumulated Depreciation	$ 14,039
Date of Acquisition	Sep. 27, 2013
Peninsula Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 14,730
Initial Cost to Company, Buildings & Improvements	19,214
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,958
Amount at Which Carried at Close of Period. Land	14,730
Amount at Which Carried at Close of Period, Buildings & Improvements	21,172
Total real estate investments	35,902
Accumulated Depreciation	$ 3,572
Date of Acquisition	Nov. 01, 2013
Country Club Village, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,986
Initial Cost to Company, Buildings & Improvements	26,579
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,017
Amount at Which Carried at Close of Period. Land	9,986
Amount at Which Carried at Close of Period, Buildings & Improvements	28,596
Total real estate investments	38,582
Accumulated Depreciation	$ 5,188
Date of Acquisition	Nov. 26, 2013
Plaza de la Canada, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,351
Initial Cost to Company, Buildings & Improvements	24,819
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	519
Amount at Which Carried at Close of Period. Land	10,351
Amount at Which Carried at Close of Period, Buildings & Improvements	25,338
Total real estate investments	35,689
Accumulated Depreciation	$ 3,777
Date of Acquisition	Dec. 13, 2013
Tigard Marketplace, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 13,587
Initial Cost to Company, Buildings & Improvements	9,603
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	565
Amount at Which Carried at Close of Period. Land	13,587
Amount at Which Carried at Close of Period, Buildings & Improvements	10,168
Total real estate investments	23,755
Accumulated Depreciation	$ 2,128
Date of Acquisition	Feb. 18, 2014
Creekside Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 14,807
Initial Cost to Company, Buildings & Improvements	29,476
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,351
Amount at Which Carried at Close of Period. Land	14,807
Amount at Which Carried at Close of Period, Buildings & Improvements	30,827
Total real estate investments	45,634
Accumulated Depreciation	$ 4,980
Date of Acquisition	Feb. 28, 2014
North Park Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 13,593
Initial Cost to Company, Buildings & Improvements	17,733
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	832
Amount at Which Carried at Close of Period. Land	13,593
Amount at Which Carried at Close of Period, Buildings & Improvements	18,565
Total real estate investments	32,158
Accumulated Depreciation	$ 2,473
Date of Acquisition	Apr. 30, 2014
Fallbrook Shopping Center
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 21,232
Initial Cost to Company, Buildings & Improvements	186,197
Cost Capitalized Subsequent to Acquisition, Land	83
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	9,286
Amount at Which Carried at Close of Period. Land	21,315
Amount at Which Carried at Close of Period, Buildings & Improvements	195,483
Total real estate investments	216,798
Accumulated Depreciation	$ 26,910
Date of Acquisition	Jun. 13, 2014
Moorpark Town Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,063
Initial Cost to Company, Buildings & Improvements	19,694
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,562
Amount at Which Carried at Close of Period. Land	7,063
Amount at Which Carried at Close of Period, Buildings & Improvements	21,256
Total real estate investments	28,319
Accumulated Depreciation	$ 3,569
Date of Acquisition	Dec. 04, 2014
Mission Foothill Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 11,415
Initial Cost to Company, Buildings & Improvements	17,783
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	107
Amount at Which Carried at Close of Period. Land	11,415
Amount at Which Carried at Close of Period, Buildings & Improvements	17,890
Total real estate investments	29,305
Accumulated Depreciation	$ 1,334
Date of Acquisition	Dec. 04, 2014
Wilsonville Town Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,334
Initial Cost to Company, Buildings & Improvements	27,101
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	622
Amount at Which Carried at Close of Period. Land	10,334
Amount at Which Carried at Close of Period, Buildings & Improvements	27,723
Total real estate investments	38,057
Accumulated Depreciation	$ 3,666
Date of Acquisition	Dec. 11, 2014
Park Oaks Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,527
Initial Cost to Company, Buildings & Improvements	38,064
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	629
Amount at Which Carried at Close of Period. Land	8,527
Amount at Which Carried at Close of Period, Buildings & Improvements	38,693
Total real estate investments	47,220
Accumulated Depreciation	$ 4,803
Date of Acquisition	Jan. 06, 2016
Ontario Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,825
Initial Cost to Company, Buildings & Improvements	26,635
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,499
Amount at Which Carried at Close of Period. Land	9,825
Amount at Which Carried at Close of Period, Buildings & Improvements	28,134
Total real estate investments	37,959
Accumulated Depreciation	$ 3,707
Date of Acquisition	Jan. 06, 2015
Winston Manor, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,018
Initial Cost to Company, Buildings & Improvements	9,762
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,854
Amount at Which Carried at Close of Period. Land	10,018
Amount at Which Carried at Close of Period, Buildings & Improvements	11,616
Total real estate investments	21,634
Accumulated Depreciation	$ 1,626
Date of Acquisition	Jan. 07, 2015
Jackson Square, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,886
Initial Cost to Company, Buildings & Improvements	24,558
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	921
Amount at Which Carried at Close of Period. Land	6,886
Amount at Which Carried at Close of Period, Buildings & Improvements	25,479
Total real estate investments	32,365
Accumulated Depreciation	$ 2,796
Date of Acquisition	Jul. 01, 2015
Tigard Promenade, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,844
Initial Cost to Company, Buildings & Improvements	10,843
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	101
Amount at Which Carried at Close of Period. Land	9,844
Amount at Which Carried at Close of Period, Buildings & Improvements	10,944
Total real estate investments	20,788
Accumulated Depreciation	$ 1,173
Date of Acquisition	Jul. 28, 2015
Sunnyside Village Square, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,428
Initial Cost to Company, Buildings & Improvements	13,324
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,412
Amount at Which Carried at Close of Period. Land	4,428
Amount at Which Carried at Close of Period, Buildings & Improvements	16,736
Total real estate investments	21,164
Accumulated Depreciation	$ 1,996
Date of Acquisition	Jul. 28, 2015
Gateway Centre, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,275
Initial Cost to Company, Buildings & Improvements	28,308
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,720
Amount at Which Carried at Close of Period. Land	16,275
Amount at Which Carried at Close of Period, Buildings & Improvements	32,028
Total real estate investments	48,303
Accumulated Depreciation	$ 3,169
Date of Acquisition	Sep. 01, 2015
Johnson Creek Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,009
Initial Cost to Company, Buildings & Improvements	22,534
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,243
Amount at Which Carried at Close of Period. Land	9,009
Amount at Which Carried at Close of Period, Buildings & Improvements	23,777
Total real estate investments	32,786
Accumulated Depreciation	$ 2,510
Date of Acquisition	Nov. 09, 2015
Iron Horse Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,187
Initial Cost to Company, Buildings & Improvements	39,654
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,571
Amount at Which Carried at Close of Period. Land	8,187
Amount at Which Carried at Close of Period, Buildings & Improvements	41,225
Total real estate investments	49,412
Accumulated Depreciation	$ 3,400
Date of Acquisition	Dec. 04, 2015
Bellevue Marketplace, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,488
Initial Cost to Company, Buildings & Improvements	39,119
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8,385
Amount at Which Carried at Close of Period. Land	10,488
Amount at Which Carried at Close of Period, Buildings & Improvements	47,504
Total real estate investments	57,992
Accumulated Depreciation	$ 3,972
Date of Acquisition	Dec. 10, 2015
Four Corner Square, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,926
Initial Cost to Company, Buildings & Improvements	31,415
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	350
Amount at Which Carried at Close of Period. Land	9,926
Amount at Which Carried at Close of Period, Buildings & Improvements	31,765
Total real estate investments	41,691
Accumulated Depreciation	$ 3,123
Date of Acquisition	Dec. 21, 2015
Warner Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,104
Initial Cost to Company, Buildings & Improvements	60,188
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8,834
Amount at Which Carried at Close of Period. Land	16,104
Amount at Which Carried at Close of Period, Buildings & Improvements	69,022
Total real estate investments	85,126
Accumulated Depreciation	$ 6,067
Date of Acquisition	Dec. 31, 2015
Magnolia Shopping Center, CA
Real Estate Properties [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land	12,501
Initial Cost to Company, Buildings & Improvements	27,040
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,866
Amount at Which Carried at Close of Period. Land	12,501
Amount at Which Carried at Close of Period, Buildings & Improvements	28,906
Total real estate investments	41,407
Accumulated Depreciation	$ 2,545
Date of Acquisition	Mar. 10, 2016
Casitas Plaza Shopping Center, CA
Real Estate Properties [Line Items]
Encumbrances	$ 7,158
Initial Cost to Company, Land	10,734
Initial Cost to Company, Buildings & Improvements	22,040
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	961
Amount at Which Carried at Close of Period. Land	10,734
Amount at Which Carried at Close of Period, Buildings & Improvements	23,001
Total real estate investments	33,735
Accumulated Depreciation	$ 1,825
Date of Acquisition	Mar. 10, 2016
Bouquet Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,040
Initial Cost to Company, Buildings & Improvements	48,362
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	479
Amount at Which Carried at Close of Period. Land	10,040
Amount at Which Carried at Close of Period, Buildings & Improvements	48,841
Total real estate investments	58,881
Accumulated Depreciation	$ 3,891
Date of Acquisition	Apr. 28, 2016
North Ranch Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 31,522
Initial Cost to Company, Buildings & Improvements	95,916
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,061
Amount at Which Carried at Close of Period. Land	31,522
Amount at Which Carried at Close of Period, Buildings & Improvements	96,977
Total real estate investments	128,499
Accumulated Depreciation	$ 6,884
Date of Acquisition	Jun. 01, 2016
Monterey Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,073
Initial Cost to Company, Buildings & Improvements	10,609
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	(36)
Amount at Which Carried at Close of Period. Land	1,073
Amount at Which Carried at Close of Period, Buildings & Improvements	10,573
Total real estate investments	11,646
Accumulated Depreciation	$ 753
Date of Acquisition	Jul. 14, 2016
Rose City Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,637
Initial Cost to Company, Buildings & Improvements	10,301
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	(78)
Amount at Which Carried at Close of Period. Land	3,637
Amount at Which Carried at Close of Period, Buildings & Improvements	10,223
Total real estate investments	13,860
Accumulated Depreciation	$ 690
Date of Acquisition	Sep. 15, 2016
The Knolls, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,726
Initial Cost to Company, Buildings & Improvements	18,299
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	20
Amount at Which Carried at Close of Period. Land	9,726
Amount at Which Carried at Close of Period, Buildings & Improvements	18,319
Total real estate investments	28,045
Accumulated Depreciation	$ 1,265
Date of Acquisition	Oct. 03, 2016
Bridle Trails Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 11,534
Initial Cost to Company, Buildings & Improvements	20,700
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,633
Amount at Which Carried at Close of Period. Land	11,534
Amount at Which Carried at Close of Period, Buildings & Improvements	24,333
Total real estate investments	35,867
Accumulated Depreciation	$ 1,551
Date of Acquisition	Oct. 17, 2016
Torrey Hills Corporate Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,579
Initial Cost to Company, Buildings & Improvements	3,915
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,435
Amount at Which Carried at Close of Period. Land	5,579
Amount at Which Carried at Close of Period, Buildings & Improvements	6,350
Total real estate investments	11,929
Accumulated Depreciation	$ 662
Date of Acquisition	Dec. 06, 2016
PCC Community Markets Plaza, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,856
Initial Cost to Company, Buildings & Improvements	6,914
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	7
Amount at Which Carried at Close of Period. Land	1,856
Amount at Which Carried at Close of Period, Buildings & Improvements	6,921
Total real estate investments	8,777
Accumulated Depreciation	$ 432
Date of Acquisition	Jan. 25, 2017
The Terraces, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 18,378
Initial Cost to Company, Buildings & Improvements	37,103
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	505
Amount at Which Carried at Close of Period. Land	18,378
Amount at Which Carried at Close of Period, Buildings & Improvements	37,608
Total real estate investments	55,986
Accumulated Depreciation	$ 2,046
Date of Acquisition	Mar. 17, 2017
Santa Rosa Southside Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,595
Initial Cost to Company, Buildings & Improvements	24,453
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,477
Amount at Which Carried at Close of Period. Land	5,595
Amount at Which Carried at Close of Period, Buildings & Improvements	25,930
Total real estate investments	31,525
Accumulated Depreciation	$ 1,308
Date of Acquisition	Mar. 24, 2017
Division Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,917
Initial Cost to Company, Buildings & Improvements	26,098
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,421
Amount at Which Carried at Close of Period. Land	6,917
Amount at Which Carried at Close of Period, Buildings & Improvements	27,519
Total real estate investments	34,436
Accumulated Depreciation	$ 1,433
Date of Acquisition	Apr. 05, 2017
Highland Hill Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,511
Initial Cost to Company, Buildings & Improvements	37,825
Cost Capitalized Subsequent to Acquisition, Land	23
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	397
Amount at Which Carried at Close of Period. Land	10,534
Amount at Which Carried at Close of Period, Buildings & Improvements	38,222
Total real estate investments	48,756
Accumulated Depreciation	$ 2,018
Date of Acquisition	May 09, 2017
Monta Loma Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 18,226
Initial Cost to Company, Buildings & Improvements	11,113
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	57
Amount at Which Carried at Close of Period. Land	18,226
Amount at Which Carried at Close of Period, Buildings & Improvements	11,170
Total real estate investments	29,396
Accumulated Depreciation	$ 426
Date of Acquisition	Sep. 19, 2017
Fullerton Crossroads, CA
Real Estate Properties [Line Items]
Encumbrances	$ 26,000
Initial Cost to Company, Land	28,512
Initial Cost to Company, Buildings & Improvements	45,419
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	234
Amount at Which Carried at Close of Period. Land	28,512
Amount at Which Carried at Close of Period, Buildings & Improvements	45,653
Total real estate investments	74,165
Accumulated Depreciation	$ 1,776
Date of Acquisition	Oct. 11, 2017
Riverstone Marketplace, CA
Real Estate Properties [Line Items]
Encumbrances	$ 18,050
Initial Cost to Company, Land	5,113
Initial Cost to Company, Buildings & Improvements	27,594
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	117
Amount at Which Carried at Close of Period. Land	5,113
Amount at Which Carried at Close of Period, Buildings & Improvements	27,711
Total real estate investments	32,824
Accumulated Depreciation	$ 1,046
Date of Acquisition	Oct. 11, 2017
North Lynnwood Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,955
Initial Cost to Company, Buildings & Improvements	10,335
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	117
Amount at Which Carried at Close of Period. Land	4,955
Amount at Which Carried at Close of Period, Buildings & Improvements	10,452
Total real estate investments	15,407
Accumulated Depreciation	$ 401
Date of Acquisition	Oct. 19, 2017
The Village at Nellie Gail Ranch, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 22,730
Initial Cost to Company, Buildings & Improvements	22,578
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	953
Amount at Which Carried at Close of Period. Land	22,730
Amount at Which Carried at Close of Period, Buildings & Improvements	23,531
Total real estate investments	46,261
Accumulated Depreciation	$ 764
Date of Acquisition	Nov. 30, 2017
Stadium Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,699
Initial Cost to Company, Buildings & Improvements	17,229
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	79
Amount at Which Carried at Close of Period. Land	1,699
Amount at Which Carried at Close of Period, Buildings & Improvements	17,308
Total real estate investments	19,007
Accumulated Depreciation	$ 391
Date of Acquisition	Feb. 23, 2018
King City Plaza, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,161
Initial Cost to Company, Buildings & Improvements	10,072
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	49
Amount at Which Carried at Close of Period. Land	5,161
Amount at Which Carried at Close of Period, Buildings & Improvements	10,121
Total real estate investments	15,282
Accumulated Depreciation	$ 215
Date of Acquisition	May 18, 2018
Initial [Member] | Pinole Vista Shopping Center, CA
Real Estate Properties [Line Items]
Date of Acquisition	Jan. 06, 2011
Initial [Member] | Aurora Square, WA
Real Estate Properties [Line Items]
Date of Acquisition	May 03, 2012
Subsequent Acquisition [Member] | Pinole Vista Shopping Center, CA
Real Estate Properties [Line Items]
Date of Acquisition	Aug. 27, 2018
Subsequent Acquisition [Member] | Aurora Square, WA
Real Estate Properties [Line Items]
Date of Acquisition	May 22, 2014