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Operations and Summary of Significant Accounting Policies - PP&E and Other Misc Disclosures (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) vote / shares series bank | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
High end of the range of the required percentage voting interest held to account for investments with the equity method of accounting | 50.00% |  |
Allowance for Doubtful Accounts |  |  |
Percentage reserved for accounts receivable due from customers in deteriorating financial condition | 100.00% |  |
Number of banks where demand deposit or money market accounts are held by the company | bank | 17 |  |
Fair Value of Financial Instruments |  |  |
United States Treasury securities and money market funds included in cash equivalents | $ 200 | $ 5,300 |
Contingent Consideration for acquisition | $ 0 | $ 1,314 | $ 0
Depreciation and Amortization |  |  |
Number of series by which the Board may issue authorized and unissued preferred stock, minimum | series | 1 |  |
Voting rights per common share | vote / shares | 1 |  |
Minimum | Buildings and site improvements |  |  |
Depreciation and Amortization |  |  |
Estimated useful life | 15 years |  |
Maximum | Buildings and site improvements |  |  |
Depreciation and Amortization |  |  |
Estimated useful life | 45 years |  |

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