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Debt Obligations - Consolidated Debt Obligations Outstanding (Parenthetical) (Details) - USD ($) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 29, 2015 | Sep. 30, 2017 | May 01, 2017 | Dec. 31, 2015
One Commerce Square [Member] | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument increase in principal |  | $ 130.0 |  |  |  |
Debt instrument maturity date |  |  | Apr. 05, 2023 |  |  |
Effective interest rate |  |  | 3.64% | [1] |  | 3.64%
$300.0M 5.70% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument maturity date | [2] |  | May 01, 2017 |  |  |
Effective interest rate | [2] |  | 5.68% |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  |  | 5.70% |
[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] | 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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