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Long-Term Debt (Narrative) (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Amount outstanding under revolving credit facility | $ 70,090,000 | $ 144,083,000
2017 | 73,000 |
2018 | 17,000 |
2019 | 0 |
2020 | 0 |
Thereafter | 70,000,000 |
Amended and Restated Revolving Credit Agreement | Bank revolving credit facility | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate commitments | 250,000,000 |
Maximum amount of aggregate commitments | 50,000,000 |
Amount outstanding under revolving credit facility | 70,000,000 | $ 144,000,000
Available borrowings | 178,286,000 |
Amended and Restated Revolving Credit Agreement | Standby Letters of Credit | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Amount of capacity | $ 1,714,000 |

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