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Fair Value Measurements (Financial Assets and Liabilities Measured on a Recurring Basis at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring | $ 3,751 | $ 4,598
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring | 3,751 | 4,055
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring |  | 543
Interest Rate Swap [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring |  | 543
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring |  | 543
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Liabilities, fair value, recurring | 1,639 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Liabilities, fair value, recurring | 1,639 |
Marketable Securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring | 1,842 | 1,907
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring | 1,842 | 1,907
Marketable Securities - Restricted [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring | 1,909 | 2,148
Marketable Securities - Restricted [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, fair value, recurring | $ 1,909 | $ 2,148

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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