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Long-Term Debt (Narrative) (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | May. 13, 2014 | May. 12, 2014
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Amount outstanding under revolving credit facility | $ 144,083,000 | $ 190,575,000 |  |
2016 | 60,000 |  |  |
2017 | 0 |  |  |
2018 | 0 |  |  |
2019 | 144,000,000 |  |  |
Thereafter | 0 |  |  |
Bank revolving credit facility | Amended and Restated Revolving Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate commitments | 250,000,000 |  |  |
Maximum amount of aggregate commitments (up to $50,000,000) | 50,000,000 |  |  |
Amount outstanding under revolving credit facility | 144,000,000 | $ 190,000,000 |  |
Available borrowings | 103,697,000 |  |  |
Bank revolving credit facility | Amended and Restated Revolving Credit Agreement | Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of capacity | $ 2,303,000 |  |  |
Specialized Industries LP | Amended and Restated Revolving Credit Agreement | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit |  |  | $ 250,000,000 | $ 100,000,000

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