Notes Payable (Terms of Notes Payable) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Notes Payable, Gross	$ 1,121,053	$ 1,067,362
Unamortized loan costs	(4,579)	(4,792)
Total Notes Payable	$ 1,116,474	1,062,570
Weighted average maturity of notes payable	5 years 4 months 24 days
Term Loan, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.69%
Notes Payable, Gross	$ 250,000	250,000
Senior Notes, Unsecured \| 3.91% Senior Note, unsecured
Debt Instrument [Line Items]
Notes Payable, Gross	250,000	250,000
Senior Notes, Unsecured \| 4.09% Senior Note, unsecured
Debt Instrument [Line Items]
Notes Payable, Gross	$ 100,000	100,000
Mortgage Debt \| Fifth Third Center
Debt Instrument [Line Items]
Interest Rate	3.37%
Notes Payable, Gross	$ 142,715	143,497
Mortgage Debt \| Colorado Tower
Debt Instrument [Line Items]
Interest Rate	3.45%
Notes Payable, Gross	$ 118,849	119,427
Mortgage Debt \| Promenade
Debt Instrument [Line Items]
Interest Rate	4.27%
Notes Payable, Gross	$ 98,438	99,238
Mortgage Debt \| 816 Congress
Debt Instrument [Line Items]
Interest Rate	3.75%
Notes Payable, Gross	$ 81,260	81,676
Mortgage Debt \| Meridian Mark Plaza
Debt Instrument [Line Items]
Interest Rate	6.00%
Notes Payable, Gross	$ 23,391	23,524
Credit Facility, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.54%
Notes Payable, Gross	$ 56,400	$ 0

Debt Instrument, Weighted Average Maturity Period

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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