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1. Significant Accounting Policies Prior Year Misstatements (Tables)
 12 Months Ended
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