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Leases (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | [1] | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [2]
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 74,990 | $ 74,261 | $ 84,262 | $ 75,872 | $ 71,841 | $ 66,116 | $ 72,440 | $ 69,481 | $ 309,385 | $ 279,879 | $ 270,866
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  | 35 years |  |
Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 15,208 | $ 16,415 | $ 13,944
[1] | Net income for the 4th quarter of 2017 includes approximately $2.5 million net tax benefit from non-recurring items of tax benefit and expense related to the Tax Cuts and Jobs Act enacted December 2017 and dissolution of a non-operating foreign subsidiary.
[2] | Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).

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