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Commitments and Contingencies (Narrative) (Details) |  | 12 Months Ended
--- | --- | ---
Mar. 26, 2018 plaintiffs | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Rent expense |  | $ 6,000,000 | $ 6,100,000 | $ 6,100,000
Assets aquired under capital leases |  | 6,200,000 | 6,600,000 |
Agreements, Future Payments, Due in One Year |  | 4,700,000 |  |
Agreements, Future Payments, Due in Two Years |  | 3,500,000 |  |
Agreements, Future Payments, Due in Three Years |  | 3,000,000 |  |
Agreements, Future Payments, Due in Four Years |  | 2,300,000 |  |
Agreements, Future Payments, Due in Five Years |  | 1,600,000 |  |
Agreements, Future Payments, Due Thereafter |  | 1,500,000 |  |
Matching contributions and plan administrative expenses |  | 2,100,000 | $ 1,900,000 | $ 1,800,000
Loss Contingency, Number of Plaintiffs | plaintiffs | 6 |  |  |
Loss Contingency, Estimate of Possible Loss |  | 650,000 |  |
Noncompete Agreements |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Future Payments, Due in One Year |  | 1,900,000 |  |
Agreements, Future Payments, Due in Two Years |  | 1,600,000 |  |
Agreements, Future Payments, Due in Three Years |  | 1,500,000 |  |
Agreements, Future Payments, Due in Four Years |  | 1,100,000 |  |
Agreements, Future Payments, Due in Five Years |  | 700,000 |  |
Agreements, Future Payments, Due Thereafter |  | 1,300,000 |  |
Consulting Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Future Payments, Due in One Year |  | 900,000 |  |
Agreements, Future Payments, Due in Two Years |  | 700,000 |  |
Agreements, Future Payments, Due in Three Years |  | 600,000 |  |
Agreements, Future Payments, Due in Four Years |  | 400,000 |  |
Agreements, Future Payments, Due in Five Years |  | 200,000 |  |
Agreements, Future Payments, Due Thereafter |  | 0 |  |
Employment Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Future Payments, Due in One Year |  | 1,900,000 |  |
Agreements, Future Payments, Due in Two Years |  | 1,200,000 |  |
Agreements, Future Payments, Due in Three Years |  | 900,000 |  |
Agreements, Future Payments, Due in Four Years |  | 800,000 |  |
Agreements, Future Payments, Due in Five Years |  | 700,000 |  |
Agreements, Future Payments, Due Thereafter |  | $ 200,000 |  |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 1 year |  |
Minimum | Noncompete Agreements |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 1 year |  |
Minimum | Consulting Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 1 year |  |
Minimum | Employment Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 3 years |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 19 years |  |
Maximum | Noncompete Agreements |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 10 years |  |
Maximum | Consulting Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 5 years |  |
Maximum | Employment Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Agreements, Term of Contract |  | 5 years |  |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition Minimum amount of other commitment maturing after the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Minimum amount of other commitment maturing in the second fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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