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Income Taxes - Expense (benefit) and deferred taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income from continuing operations before income taxes: US |  | $ 128,040 | $ 116,273 | $ 74,115
Currently payable: |  |  |  |
U.S. Federal |  | 25,003 | 24,594 | 9,656
State and local |  | 4,438 | 3,646 | 1,811
Deferred: |  |  |  |
U.S. Federal |  | (61,024) | 10,966 | 12,633
State and local |  | 1,490 | 4,461 | (29,108)
Income Tax Expense (Benefit), Total |  | (30,093) | 43,667 | $ (5,008)
Deferred tax assets: |  |  |  |
Receivables, net |  | 1,280 | 1,830 |
Inventories, net |  | 1,307 | 1,614 |
Other assets, principally share-based compensation |  | 2,317 | 2,198 |
Accrued liabilities |  | 5,286 | 10,514 |
Long-term liabilities |  | 9,020 | 13,731 |
Net operating loss carryforward |  | 21,381 | 17,979 |
Total deferred tax assets, gross |  | 40,591 | 47,866 |
Deferred tax valuation allowance |  | 0 | 0 |
Deferred tax assets, net |  | 40,591 | 47,866 |
Deferred tax liabilities: |  |  |  |
Property and equipment, net |  | 13,008 | 14,703 |
Intangibles, net |  | 142,118 | 207,116 |
Other |  | 176 | 293 |
Total deferred tax liabilities, gross |  | 155,302 | 222,112 |
Net deferred tax liability |  | $ 114,711 | $ 174,246 |
Tax Act |  |  |  |
Corporate tax rate (as a percent) |  | 35.00% | 35.00% | 35.00%
Tax benefit as a result of adjustment to deferred tax balances related to Tax Act |  | $ 74,100 |  |
Other disclosures |  |  |  |
Tax benefit resulting from a change in valuation allowance against state and local deferred tax assets |  |  | $ 800 | $ 33,700
Net long-term deferred tax assets |  | 18,129 | 19,469 |
Net long-term deferred tax liabilities |  | 132,840 | 193,715 |
Deferred tax assets, operating loss carryforward, subject to expiration |  | $ 21,000 | $ 18,000 |
Scenario, Forecast |  |  |  |
Tax Act |  |  |  |
Corporate tax rate (as a percent) | 21.00% |  |  |

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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