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Investments (Narrative) (Details) - RLJE [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Jun. 20, 2017 | Jun. 16, 2017 | Jan. 30, 2017 | Oct. 14, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 65,000
Investment Warrants, Exercise Price |  | $ 3.00 |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Equity Method, before Tax | $ 500 | $ 1,900 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Warrants Received per RLJE Investment Agreement |  |  |  |  |  | 20,000,000
Tranche A Loan [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 13,000 | $ 5,000
Shares Acquired from Exercise of Warrants |  |  | 1,667,000 |  |  |
Tranche B Loan [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 55,000 |  |  | $ 60,000
Loan Forgiven in Lieu of Exercise Price for Warrants Exercised |  |  | $ 5,000 |  |  |
Amended Tranche A Loan [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 8,000 |
Tranche A-2 Loan [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 10,000 |  |

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