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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated debt obligations |  |  |  |  |
Total Debt Obligations |  | $ 2,012,671 |  | $ 2,013,112 |
Secured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | 323,823 |  | 325,038 |
Plus: premiums/(discounts), net |  | (2,652) |  | (2,761) |
Less: deferred financing costs |  | (687) |  | (728) |
Total mortgage indebtedness |  | 320,484 |  | 321,549 |
Unsecured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | 1,703,610 |  | 1,703,610 |
Plus: premiums/(discounts), net |  | (4,424) |  | (4,678) |
Less: deferred financing costs |  | (6,999) |  | (7,369) |
Total unsecured indebtedness |  | 1,692,187 |  | 1,691,563 |
Two Logan Square [Member] | Secured Debt [Member] |  |  |  |  |
Consolidated debt obligations |  |  |  |  |
Long-term Debt, Gross |  | $ 85,625 |  | 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 |  | $ 126,198 |  | 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 |  |  |
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 |  | $ 300,000 |  | 300,000 |
Effective interest rate |  | 5.68% |  |  |
Debt instrument maturity date |  | 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) [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) [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) [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 term of the scheduled maturity 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 outstanding on 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 outstanding on One Commerce Square. This loan is also secured by a lien on One Commerce Square.

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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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