Note 1 - Description of Business and Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Property and equipment, gross | $ 719,260 | $ 655,487 |
Accumulated depreciation | (368,602) | (329,394) |
Total property and equipment, net | 350,658 | 326,093 |
Land [Member] | ||
Property and equipment, gross | 50,458 | 44,611 |
Building and Building Improvements [Member] | ||
Property and equipment, gross | $ 156,924 | 139,078 |
Building and Building Improvements [Member] | Minimum [Member] | ||
Estimated Useful Lives (Year) | 7 years | |
Building and Building Improvements [Member] | Maximum [Member] | ||
Estimated Useful Lives (Year) | 40 years | |
Equipment [Member] | ||
Property and equipment, gross | $ 511,878 | $ 471,798 |
Equipment [Member] | Minimum [Member] | ||
Estimated Useful Lives (Year) | 3 years | |
Equipment [Member] | Maximum [Member] | ||
Estimated Useful Lives (Year) | 20 years |