Note 12 - Acquisitions - Revenue and Operating Income from Acquisitions (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Acquisitions 2016 [Member] | ||||
| Revenue | $ 82,730 | |||
| Operating income | 993 | |||
| Revenue | $ 2,269,967 | $ 2,084,845 | 6,386,167 | $ 5,870,970 |
| Operating income | $ 93,423 | $ 72,797 | $ 256,847 | $ 226,320 |