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Financial Instruments and Concentration of Credit Risk - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Interest rate swap expiration | 2020-11 |  |  |
Unrealized gain (loss) on derivative, net of tax | $ (3,142) | $ (3,716) | $ (1,362) |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ 1,118 | 1,242 | 236 |
Concentration Risk Customer Accounts Receivable | One of the most significant credit risks is the ultimate realization of accounts receivable. This risk is mitigated by (i) sales to well established companies, (ii) ongoing credit evaluation of customers, and (iii) frequent contact with customers, thus enabling management to monitor current changes in business operations and to respond accordingly. Management considers these concentrations of credit risks in establishing our allowance for doubtful accounts and believes these allowances are adequate. The Company had one customer whose gross accounts receivable exceeded 10% of total gross accounts receivable as of December 31, 2020. |  |  |
Accounts Receivable [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% |  |  |
Interest Rate Swap [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Interest rate swap notional amount | $ 136,900 | $ 144,400 |  | $ 155,300
Fixed interest rate | 2.928% | 2.928% |  | 1.4935%
Gain on contract termination |  |  | 3,500 |
Fair value of interest rate swap | $ 9,000 | $ 6,300 |  |
Unrealized gain (loss) on interest rate swap | (2,700) | 3,300 | 1,500 |
Unrealized gain (loss) on derivative, net of tax | (2,000) | 2,500 | 1,100 |
Amounts classified from accumulated other comprehensive income | 1,500 | 1,700 | 300 |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ 1,100 | $ 1,200 | $ 200 |
Customer Accounts Receivable [Member] | Accounts Receivable [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Concentration risk, percentage | 11.80% |  |  |

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