Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

The Company's intangible assets consisted of the following (in thousands):

		December 31, 2018							December 31, 2017
	Weighted Average Amortization Period (in Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Below market ground leases	27	$	49,708	$	(3,447	)	$	46,260	$	118,050	$	(1,176	)	$	116,873
Other intangible assets		—		—			—		1,361		(65		)	1,297
Intangible assets, net	27	$	49,708	$	(3,447	)	$	46,260	$	119,411	$	(1,241	)	$	118,170

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

As of December 31, 2018, the estimated amortization expense for the intangible assets over the next five years is as follows (in thousands):

	2019		2020		2021		2022		2023
Estimated amortization expense	$	2,586	$	2,586	$	2,586	$	2,586	$	2,586