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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated debt obligations |  |  |  |  |
Plus: premiums/(discounts), net |  | $ (6,371) |  |  |
Less: deferred financing costs |  | (6,956) |  |  |
Line of credit |  | 178,000 |  | $ 0 |
Total Debt Obligations |  | 1,889,640 |  | 2,013,112 |
Secured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | 321,357 |  | 325,038 |
Plus: premiums/(discounts), net |  | (2,434) |  | (2,761) |
Less: deferred financing costs |  | (606) |  | (728) |
Total mortgage indebtedness |  | 318,317 |  | 321,549 |
Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | 1,581,610 |  | 1,703,610 |
Plus: premiums/(discounts), net |  | (3,937) |  | (4,678) |
Less: deferred financing costs |  | (6,350) |  | (7,369) |
Total unsecured indebtedness |  | 1,571,323 |  | 1,691,563 |
Two Logan Square [Member] | Secured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 84,839 |  | 86,012 |
Effective interest rate |  | 3.98% |  |  |
Debt instrument maturity date |  | May 01, 2020 |  |  |
One Commerce Square [Member] | Secured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 124,518 |  | 127,026 |
Effective interest rate |  | 3.64% | [1] |  | 3.64%
Debt instrument maturity date |  | Apr. 05, 2023 |  |  |
Two Commerce Square [Member] | Secured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 112,000 |  | 112,000 |
Effective interest rate | [2] | 4.51% |  |  |
Debt instrument maturity date |  | Apr. 05, 2023 |  |  |
Revolving Credit Facility [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Line of credit |  | $ 178,000 |  |  |
Effective interest rate, description |  | LIBOR + 1.20% |  |  |
Debt instrument maturity date |  | May 31, 2019 |  |  |
Revolving Credit Facility [Member] | Unsecured Debt [Member] | LIBOR [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Spread on variable rate |  | 1.20% |  |  |
Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000 |
Effective interest rate |  | 3.72% |  |  |
Debt instrument maturity date |  | Oct. 01, 2022 |  |  |
$300.0M 5.70% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross | [3] |  |  | 300,000 |
Effective interest rate | [3] | 5.68% |  |  |
Debt instrument maturity date | [3] | May 01, 2017 |  |  |
$325.0M 4.95% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 325,000 |  | 325,000 |
Effective interest rate |  | 5.13% |  |  |
Debt instrument maturity date |  | Apr. 15, 2018 |  |  |
$250M 3.95% Guaranteed Notes due 2023 [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000 |
Effective interest rate |  | 4.02% |  |  |
Debt instrument maturity date |  | Feb. 15, 2023 |  |  |
250.0M 4.10% Guaranteed Notes due 2024 [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000 |
Effective interest rate |  | 4.33% |  |  |
Debt instrument maturity date |  | Oct. 01, 2024 |  |  |
$250M 4.55% Guaranteed Notes due 2029 [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 250,000 |  | 250,000 |
Effective interest rate |  | 4.60% |  |  |
Debt instrument maturity date |  | Oct. 01, 2029 |  |  |
Indenture IA (Preferred Trust I) - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 27,062 |  | 27,062 |
Effective interest rate |  | 2.75% |  |  |
Debt instrument maturity date |  | Mar. 30, 2035 |  |  |
Indenture IB (Preferred Trust I) - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 25,774 |  | 25,774 |
Effective interest rate |  | 3.30% |  |  |
Debt instrument maturity date |  | Apr. 30, 2035 |  |  |
Indenture II (Preferred Trust II) - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 25,774 |  | $ 25,774 |
Effective interest rate |  | 3.09% |  |  |
Debt instrument maturity date |  | Jul. 30, 2035 |  |  |
[1] | This loan was assumed upon acquisition of the related properties on December 19, 2013. On December 29, 2015, the Company refinanced the debt increasing the principal balance to $130.0 million and extended the scheduled maturity date from January 6, 2016 to April 5, 2023. The effective interest rate as of December 31, 2015 was 3.64%. A default under this loan will also constitute a default under the loan secured by Two Commerce Square. This loan is also secured by a lien on Two Commerce Square.
[2] | This loan was assumed upon acquisition of the related property on December 19, 2013. The interest rate reflects the market rate at the time of acquisition. A default under this loan will also constitute a default under the loan secured by One Commerce Square. This loan is also secured by a lien on One Commerce Square.
[3] | On May 1, 2017, the entire principal balance of the unsecured 5.70% Guaranteed Notes was repaid upon maturity. Available cash balances and the Credit Facility (as defined below) were used to fund the repayment of the unsecured notes.

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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