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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Income Taxes [Line Items] |  |  |  |
Federal tax rate |  | 35.00% | 35.00% | 35.00%
Effective tax rate |  | (24.50%) | 30.10% | 35.70%
2017 tax reform |  | $ (49,336) |  |
Effective tax rate, excluding bargain purchase gain |  |  | 37.20% |
Operating Loss Carryforwards |  | 98,100 |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 1,567 | $ 1,860 | $ 1,264
Scenario, Plan [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal tax rate | 21.00% |  |  |
Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2027 |  |
Earliest Tax Year [Member] | PENNSYLVANIA |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open Tax Year |  | 2014 |  |
Latest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Internal Revenue Service income tax examination, year |  | 2008 |  |
Latest Tax Year [Member] | PENNSYLVANIA |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open Tax Year |  | 2017 |  |
Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income Taxes Paid |  | $ 12,000 | 27,300 | 28,000
State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income Taxes Paid |  | $ 1,000 | $ 3,700 | $ 2,200

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 + 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 income tax rates. + 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 15 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32059-109318 + Details
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