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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Amortization of deferred financing fees |  |
Amortization expense in 2018 | $ 4,778 |
Amortization expense in 2019 | 4,374 |
Amortization expense in 2020 | 3,481 |
Amortization expense in 2021 | 3,366 |
Amortization expense in 2022 | 1,523 |
Amortization expense thereafter | 15,600 |
Unsecured Term Loans, Senior Notes, and Mortgage Notes Payable |  |
Debt Instrument [Line Items] |  |
Deb issuance costs, gross | 39,821 | $ 49,331
Accumulated amortization, debt issuance costs gross | 13,085 | 17,560
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Deb issuance costs, gross | 17,170 | 10,980
Accumulated amortization, debt issuance costs gross | $ 10,784 | $ 9,039

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- Definition Represents the amount of amortization of deferred financing fees expected to be recognized after the fifth succeeding fiscal year. + References No definition available. + Details
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- Definition Amount of accumulated amortization of debt issuance 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 Amount, before 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 + Details
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