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1. Significant Accounting Policies Prior Year Misstatements (Tables) | 12 Months Ended
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Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items] |
Schedule of Quantifying Prior Year Misstatements Corrected in Current Year Financial Statements [Table Text Block] | The impact of the reclassification, and the immaterial error corrections, both described above on our Consolidated Balance Sheet and Consolidated Statements of Income for the periods presented is as follows (in thousands, except per share data):
|  | December 31, 2016
|  | As reported |  | Adjustment |  | As revised
Buildings and leasehold improvements |  | $ | 290,367 |  |  | $ | 10,467 |  |  | $ | 300,834 |
Equipment |  | 919,126 |  |  | (10,467 | ) |  | 908,659 |
Deferred income taxes |  | 222,919 |  |  | 2,380 |  |  | 225,299 |
Other long-term liabilities |  | 135,318 |  |  | 5,219 |  |  | 140,537 |
Total liabilities |  | 1,263,745 |  |  | 7,599 |  |  | 1,271,344 |
Retained earnings |  | 1,836,180 |  |  | (7,599 | ) |  | 1,828,581 |
Total stockholders' equity |  | $ | 2,586,759 |  |  | $ | (7,599 | ) |  | $ | 2,579,160 |
| Year ended December 31,
| 2016 |  | 2015
| As reported | Adjustment | As revised |  | As reported | Adjustment | As revised
Provision for income taxes | $ | (13,435 | ) | $ | (2,125 | ) | $ | (15,560 | ) |  | $ | (32,754 | ) | $ | (3,854 | ) | $ | (36,608 | )
Net income | $ | 28,125 |  | $ | (2,125 | ) | $ | 26,000 |  |  | $ | 113,093 |  | $ | (3,854 | ) | $ | 109,239 |
Net income per basic share | $ | 0.96 |  | $ | (0.08 | ) | $ | 0.88 |  |  | $ | 3.87 |  | $ | (0.13 | ) | $ | 3.74 |
Net income per diluted share | $ | 0.95 |  | $ | (0.07 | ) | $ | 0.88 |  |  | $ | 3.85 |  | $ | (0.14 | ) | $ | 3.71 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the nature and amount of prior period errors that had previously been considered immaterial and which are being corrected in the current fiscal year. This disclosure would also generally include when and how each error being corrected arose and assert that the errors were immaterial to the prior amounts reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 1.N) -URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693 + Details
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