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Fair Value of Financial Instruments - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) financial_instrument shares | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) financial_instrument shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Realized gain (loss) on sale of equity securities |  |  |  | $ (38,000) | $ 474,000 |
Unrealized gains on equity securities |  |  |  | 208,000 | (282,000) |
Net realizable value | $ 89,007,000 |  |  | 89,007,000 |  | $ 98,186,000
Goodwill impairment | $ 10,748,000 |  | $ 0 | $ 10,748,000 | $ 0 |
Welded Pipe & Tube |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value less than carrying value | 9.70% |  |  | 9.70% |  |
Goodwill impairment | $ 10,700,000 | $ 0 |  |  |  |
Fair Value, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Sale of shares equity securities investments (in shares) | shares | 494,074 |  |  | 1,200,000 |  |
Realized gain (loss) on sale of equity securities | $ (69,375) |  |  | $ (37,954) |  |
Unrealized gains on equity securities | 0 |  |  | 200,000 |  |
Fair value of equity securities | $ 0 |  |  | $ 0 |  | 4,300,000
Derivative asset, number of instruments held | financial_instrument | 1 |  |  | 1 |  |
$20 million Term loan, due February 1, 2024 | Interest Rate Swap | Level 2 Inputs | Fair Value, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative liability | $ 100,000 |  |  | $ 100,000 |  |
Derivative asset |  |  |  |  |  | $ 6,088
Palmer of Texas | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Net realizable value |  | 2,100,000 |  |  |  |
Fair value |  | 1,700,000 |  |  |  |
Asset impairments |  | $ 6,100,000 |  |  |  |

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