| Net Income | | 39,510.0 | 53,394.0 | 45,687.0 | 48,351.0 | 59,531.0 | 55,256.0 | 57,411.0 | 94,680.0 | 99,803.0 | 95,171.0 |
| Net Income % Chg. | | 6.7% | 35.1% | -14.4% | 5.8% | 23.1% | -7.2% | 3.9% | 64.9% | 5.4% | -5.4% |
| Depreciation & Amortization | | 7,946.0 | 11,257.0 | 10,505.0 | 10,157.0 | 10,903.0 | 12,547.0 | 11,056.0 | 11,284.0 | 11,104.0 | 11,323.0 |
| Depreciation & Amortization % Chg. | | 17.6% | 41.7% | -6.7% | -3.3% | 7.3% | 15.1% | -11.9% | 2.1% | -1.6% | 0.1% |
| Deferred Income Tax | | 2,347.0 | 1,382.0 | 4,938.0 | 5,966.0 | -32,590.0 | -340.0 | -215.0 | -4,774.0 | 895.0 | - |
| Deferred Income Tax % Chg. | | 105.7% | -41.1% | 257.3% | 20.8% | - | 99.0% | 36.8% | 2120.5% | - | - |
| Stock-based Compensation | | 2,863.0 | 3,586.0 | 4,210.0 | 4,840.0 | 5,340.0 | 6,068.0 | 6,829.0 | 7,906.0 | 9,038.0 | 9,678.0 |
| Stock-based Compensation % Chg. | | 27.1% | 25.3% | 17.4% | 15.0% | 10.3% | 13.6% | 12.5% | 15.8% | 14.3% | 18.7% |
| Change in Working Capital | | 7,047.0 | 11,647.0 | 484.0 | -5,550.0 | 34,694.0 | -3,488.0 | 5,690.0 | -4,911.0 | 1,200.0 | -7,139.0 |
| Change in Working Capital % Chg. | | 8.8% | 65.3% | -95.8% | - | - | - | - | - | - | 90.8% |
| Other Non-Cash Items | | - | - | - | -166.0 | -444.0 | -652.0 | -97.0 | -147.0 | 111.0 | - |
| Other Non-Cash Items % Chg. | | - | - | - | - | 167.5% | 46.8% | 85.1% | 51.5% | - | - |
| Net Cash Provided by Operating Activities | | 59,713.0 | 81,266.0 | 65,824.0 | 63,598.0 | 77,434.0 | 69,391.0 | 80,674.0 | 104,038.0 | 122,151.0 | 109,190.0 |
| Net Cash Provided by Operating Activities % Chg. | | 11.3% | 36.1% | -19.0% | -3.4% | 21.8% | -10.4% | 16.3% | 29.0% | 17.4% | -2.7% |