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Summary Accounting Policies - Leases - As Lessor - Minimum Future Rents (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Minimum future contractual rents to be received under ASC 842
From April 1 - December 31, 2019	$ 50,678
For the year ended December 31, 2020	67,572
For the year ended December 31, 2021	66,039
For the year ended December 31, 2022	57,422
For the year ended December 31, 2023	48,624
For the year ended December 31, 2024	40,687
Thereafter	169,205
Total	$ 500,227
Minimum future contractual rents to be received under ASC 840
For the year ended December 31, 2019		$ 66,959
For the year ended December 31, 2020		66,691
For the year ended December 31, 2021		65,130
For the year ended December 31, 2022		56,444
For the year ended December 31, 2023		47,644
Thereafter		208,923
Total		$ 511,791

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- Definition

Amount of lease payments to be received by lessor after sixth fiscal year following latest statement of financial position date for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor for operating lease.

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-SubTopic 30
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Amount of lease payments to be received by lessor in fifth fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in fourth year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in remainder of fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in third fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in second fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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