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Income Taxes Deferred tax assets and liabilties (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Taxes [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | $ 224 | $ 515
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 3,179 | 6,550
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 92 | 156
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance | 15,415 | 18,225
Deferred Tax Assets, Operating Loss Carryforwards | 0 | 237
Unrecognized tax benefit | 963 | 1,278
Deferred Tax Assets, Other | 2 | 0
Deferred Tax Assets, Gross | 19,875 | 26,961
Deferred Tax Assets, Valuation Allowance | 0 | 0
Deferred Tax Assets, Net | 19,875 | 26,961
Deferred Tax Liabilities, Property, Plant and Equipment | (74,794) | (81,322)
Deferred Tax Liabilities, Goodwill and Intangible Assets | (10,319) | (7,984)
Deferred Tax Liabilities, Prepaid Expenses | (1,268) | (1,406)
Deferred Income Tax Liabilities | (86,381) | (90,712)
Deferred Tax Liabilities, Net | $ (66,506) | $ (63,751)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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