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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Amortization of deferred financing fees |  |
Amortization expense in 2017 | $ 5,829 |
Amortization expense in 2018 | 4,084 |
Amortization expense in 2019 | 3,225 |
Amortization expense in 2020 | 1,810 |
Amortization expense in 2021 | 1,695 |
Amortization expense thereafter | 17,069 |
Unsecured Term Loans, Senior Notes, and Mortgage Notes Payable |  |
Indebtedness |  |
Deb issuance costs, gross | 49,331 | $ 39,497
Accumulated amortization, debt issuance costs gross | 17,560 | 15,608
Revolving Credit Facility |  |
Indebtedness |  |
Debt issuance costs, line of credit arrangements, gross | 10,980 | 10,980
Accumulated amortization, debt issuance costs gross | $ 9,039 | 7,174
Assets | Accounting Standards Update 2015-03 | Unsecured Term Loan |  |
Indebtedness |  |
Debt issuance costs, net |  | (3,695)
Assets | Accounting Standards Update 2015-03 | Senior Unsecured Notes |  |
Indebtedness |  |
Debt issuance costs, net |  | (16,530)
Assets | Accounting Standards Update 2015-03 | Secured Debt And Capital Lease |  |
Indebtedness |  |
Debt issuance costs, net |  | (3,664)
Debt | Accounting Standards Update 2015-03 | Unsecured Term Loan |  |
Indebtedness |  |
Debt issuance costs, net |  | 3,695
Debt | Accounting Standards Update 2015-03 | Senior Unsecured Notes |  |
Indebtedness |  |
Debt issuance costs, net |  | 16,530
Debt | Accounting Standards Update 2015-03 | Secured Debt And Capital Lease |  |
Indebtedness |  |
Debt issuance costs, net |  | $ 3,664

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