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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value) (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | $ 23,166 | $ 35,162
Marketable securities |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 23,166 | 35,156
Interest rate cap (included in other assets) |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 0 | 6
Level 1 |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 23,166 | 35,156
Level 1 | Marketable securities |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 23,166 | 35,156
Level 1 | Interest rate cap (included in other assets) |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 0 | 0
Level 2 |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 0 | 6
Level 2 | Marketable securities |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 0 | 0
Level 2 | Interest rate cap (included in other assets) |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 0 | 6
Level 3 |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 0 | 0
Level 3 | Marketable securities |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | 0 | 0
Level 3 | Interest rate cap (included in other assets) |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Total assets | $ 0 | $ 0

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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