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Subsequent Events (Narrative) (Details) - Credit 2019 Agreement [Member] - First Modification Agreement [Member] - Subsequent Event [Member] - USD ($) $ in Millions | Jul. 08, 2020 | Jul. 07, 2020
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Subsequent Event [Line Items] |  |
Capital expenditures | $ 8.5 |
Domestic cash balances, prohibited holding amount | $ 5.0 |
Percentage added to LIBOR rate | 3.00% | 1.85%
Unused credit commitment fee | 0.50% | 0.20%
Minimum [Member] | August 31, 2020 Through May 31, 2021 [Member] |  |
Subsequent Event [Line Items] |  |
Minimum liquidity | $ 13.0 |
Minimum [Member] | May 31, 2021 [Member] |  |
Subsequent Event [Line Items] |  |
Minimum liquidity | $ 8.0 |

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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