Basis of Presentation and Significant Accounting Policies (Revenue Recognition and Income Taxes) (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Revenue Recognition [Abstract]
Net increase in rental revenues due to straight-line rent adjustments	$ 2,800,000us-gaap_StraightLineRentAdjustments	$ 1,600,000us-gaap_StraightLineRentAdjustments
Net increase in rental revenue due to amortization of above and below market leases	1,187,000	1,154,000
Lease termination fee revenue	500,000tier_LeaseTerminationFeeRevenue	200,000tier_LeaseTerminationFeeRevenue
Income Taxes
Deferred tax liabilities	2,600,000us-gaap_DeferredIncomeTaxLiabilities		2,900,000us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets, net of related valuation allowances	$ 2,400,000us-gaap_DeferredTaxAssetsNet		$ 2,500,000us-gaap_DeferredTaxAssetsNet

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Revenue related to Lease Termination Fees

+ References

No definition available.

+ Details

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- Definition

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

+ References

No definition available.

+ Details

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Liability

-URI http://asc.fasb.org/extlink&oid=6510232

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph b(2)

-Article 7

+ Details

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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- Details

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- Definition

Amount of the adjustment to rental revenues to measure escalating leasing revenues on a straight line basis.

+ References

No definition available.

+ Details

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