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Income Taxes Deferred tax assets and liabilties (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | $ 34,664 | $ 33,364 | $ 6,860
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 559 | 562 |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 9,275 | 9,212 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 254 | 529 |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance | 29,190 | 28,159 |
Deferred Tax Assets, Operating Loss Carryforwards | 451 | 1,688 |
Deferred Tax Assets, Tax Deferred Expense | 3,334 | 4,262 |
Deferred Tax Assets, Other | 2 | 387 |
Deferred Tax Assets, Gross | 43,065 | 44,799 |
Deferred Tax Assets, Valuation Allowance | 0 | 0 |
Deferred Tax Assets, Net | 43,065 | 44,799 |
Deferred Tax Liabilities, Property, Plant and Equipment | (122,367) | (133,720) |
Deferred Tax Liabilities, Goodwill and Intangible Assets | (9,857) | (3,725) |
Deferred Tax Liabilities, Prepaid Expenses | 1,713 | 2,810 |
Deferred Income Tax Liabilities | (133,937) | (140,255) |
Deferred Tax Liabilities, Net | $ (90,872) | $ (95,456) |

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: 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.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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