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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Other Liabilities Disclosure [Abstract] |  |  |  |  |
Prepaid rent | $ 11,245 |  |  |  | $ 10,519
Prepaid maintenance expenses | 3,981 |  |  |  | 3,062
Interest rate swaps | 4,930 |  |  |  | 2,411
Deferred contract costs | 37,957 |  |  |  | 0
Other | 2,049 |  |  |  | 1,119
Prepaid expenses and other | $ 60,162 | $ 59,407 | $ 58,459 | $ 46,987 | $ 17,111

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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