| Quarterly Financial Information [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 266,121 | | | $ | 275,399 | | | $ | 259,574 | | | $ | 264,262 | | | | | | 244,949 | | | | 261,320 | | | | 248,043 | | | | 258,838 | | | | | | | | | | | | | | | | | | | | | | | | 21,172 | | | | 14,079 | | | | 11,531 | | | | 5,424 | | | | | | 3,252 | | | | 3,779 | | | | 3,632 | | | | 3,135 | | | | | | | | | | | | | | | | | | | | | | | | 17,920 | | | | 10,300 | | | | 7,899 | | | | 2,289 | | | | | | 6,553 | | | | 3,685 | | | | 2,660 | | | | 666 | | | | | | | | | | | | | | | | | | | | | | | | 11,367 | | | | 6,615 | | | $ | 5,239 | | | $ | 1,623 | | | | | | | | | | | | | | | | | | | | | | | $ | 0.41 | | | $ | 0.24 | | | $ | 0.19 | | | $ | 0.06 | | | | | $ | 0.41 | | | $ | 0.24 | | | $ | 0.19 | | | $ | 0.06 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 193,416 | | | $ | 222,371 | | | $ | 231,702 | | | $ | 253,267 | | | | | | 179,948 | | | | 206,802 | | | | 216,374 | | | | 231,846 | | | | | | | | | | | | | | | | | | | | | | | | 13,468 | | | | 15,569 | | | | 15,328 | | | | 21,421 | | Other expense (income), net | | | 1,092 | | | | 1,969 | | | | 2,066 | | | | 2,797 | | | | | | | | | | | | | | | | | | | | | | | | 12,376 | | | | 13,600 | | | | 13,262 | | | | 18,624 | | | | | | 4,329 | | | | 5,057 | | | | 4,670 | | | | 6,589 | | | | | | | | | | | | | | | | | | | | | | | $ | 8,047 | | | $ | 8,543 | | | $ | 8,592 | | | $ | 12,035 | | | | | | | | | | | | | | | | | | | | | | | $ | 0.35 | | | $ | 0.37 | | | $ | 0.37 | | | $ | 0.48 | | | | | $ | 0.34 | | | $ | 0.36 | | | $ | 0.36 | | | $ | 0.47 | |
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