Acquired In-Place Leases (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following is a summary of our acquired lease assets and liabilities:

	December 31, 2017						December 31, 2016
	Cost			Accumulated Amortization			Cost			Accumulated Amortization
	(in thousands)
Above market leases, lessor	$	52,393		$	(31,406	)	$	45,327		$	(28,085	)
Below market leases, lessee	34,604			(1,705		)	13,237			(924		)
Total	$	86,997		$	(33,111	)	$	58,564		$	(29,009	)
Below market leases, lessor	$	(193,085	)	$	56,716		$	(138,253	)	$	48,928
Above market leases, lessee	(9,084		)	560			(2,796		)	271
Total	$	(202,169	)	$	57,276		$	(141,049	)	$	49,199

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

The following is a summary of acquired lease amortization:

	Year Ended December 31,
	2017			2016			2015
	(in thousands)
Amortization of above market leases, lessor	$	(6,005	)	$	(6,726	)	$	(4,425	)
Amortization of below market leases, lessor	10,726			8,551			7,130
Net increase in rental income	$	4,721		$	1,825		$	2,705
Amortization of below market leases, lessee	$	781		$	255		$	255
Amortization of above market leases, lessee	(290		)	(135		)	(135		)
Net increase in rental expense	$	491		$	120		$	120

The following is a summary of the remaining weighted average amortization period for our acquired lease assets and acquired lease liabilities:

	December 31, 2017
Above market leases, lessor	4.7 years
Below market leases, lessee	41.6 years
Below market leases, lessor	19.8 years
Above market leases, lessee	16.9 years

Amortization for acquired in-place leases during the next five years and thereafter

The amortization for acquired in-place leases during the next five years and thereafter, assuming no early lease terminations, is as follows:

	Acquired Lease Assets		Acquired Lease Liabilities
	(In thousands)
Year ending December 31,
2018	$	5,810	$	9,990
2019	3,829		9,488
2020	3,182		8,494
2021	2,804		7,869
2022	2,381		7,484
Thereafter	35,880		101,568
	$	53,886	$	144,893