| | December 31, | | |||||||
| | 2017 | | 2016 | | 2015 | | |||
Past due 0 to 60 days | | | 200,413 | | | 164,458 | | | 129,315 | |
Past due by more than 60 days | | | 6,190 | | | 3,395 | | | 3,443 | |
| | $ | 206,603 | | | 167,853 | | | 132,758 | |