| Net Income | 110,996 | 100,118 | 73,795 | 59,972 | 76,033 | 40,269 | |
| Depreciation & Amortization | 16,385 | 15,311 | 11,946 | 13,475 | 10,273 | 13,679 | |
| Asset Writedown & Restructuring Costs | - | - | - | - | - | 18 | |
| Loss (Gain) From Sale of Investments | -10,850 | -2,671 | 823 | 5,519 | -12,270 | -6,317 | |
| Stock-Based Compensation | 23,037 | 22,785 | 22,460 | 19,362 | 15,376 | 12,991 | |
| Other Operating Activities | -3,262 | -1,838 | -3,433 | -4,598 | 3,763 | 2,657 | |
| Change in Accounts Receivable | -7,420 | -5,891 | -7,833 | -2,317 | -9,095 | -6,524 | |
| Change in Accounts Payable | 1,603 | 359 | 664 | 707 | 283 | 694 | |
| Change in Unearned Revenue | 1,684 | 1,043 | 525 | 367 | 774 | 635 | |
| Change in Income Taxes | 1,768 | -2,418 | 523 | 584 | -625 | 1,209 | |
| Change in Other Net Operating Assets | -1,340 | -1,499 | 2,276 | -1,576 | 7,140 | 5,813 | |
| Operating Cash Flow | 132,601 | 125,299 | 101,746 | 91,495 | 91,652 | 65,124 | |
| Operating Cash Flow Growth | 23.83% | 23.15% | 11.20% | -0.17% | 40.73% | 19.45% | |
| Capital Expenditures | -57,720 | -52,535 | -32,251 | -31,485 | -24,640 | -22,281 | |
| Cash Acquisitions | -3,210 | -2,931 | -495 | -6,969 | -2,618 | -738 | |
| Investment in Securities | 10,382 | 12,597 | 6,734 | 16,567 | -8,806 | -9,822 | |
| Other Investing Activities | -2,618 | -2,667 | -1,051 | 1,589 | 541 | 68 | |
| Investing Cash Flow | -53,166 | -45,536 | -27,063 | -20,298 | -35,523 | -32,773 | |
| Long-Term Debt Issued | - | 13,589 | 10,790 | 52,872 | 20,199 | 11,761 | |
| Long-Term Debt Repaid | - | -12,701 | -11,550 | -54,068 | -21,435 | -2,100 | |
| Net Debt Issued (Repaid) | 1,996 | 888 | -760 | -1,196 | -1,236 | 9,661 | |
| Repurchase of Common Stock | -61,594 | -62,222 | -61,504 | -59,296 | -50,274 | -31,149 | |
| Common Dividends Paid | -9,797 | -7,363 | - | - | - | - | |
| Other Financing Activities | -10,825 | -11,036 | -9,829 | -9,265 | -9,852 | -2,920 | |
| Financing Cash Flow | -80,220 | -79,733 | -72,093 | -69,757 | -61,362 | -24,408 | |
| Foreign Exchange Rate Adjustments | -444 | -612 | -421 | -506 | -287 | 24 | |
| Net Cash Flow | -1,229 | -582 | 2,169 | 934 | -5,520 | 7,967 | |
| Free Cash Flow | 74,881 | 72,764 | 69,495 | 60,010 | 67,012 | 42,843 | |
| Free Cash Flow Growth | 8.35% | 4.70% | 15.81% | -10.45% | 56.41% | 38.33% | |
| Free Cash Flow Margin | 20.82% | 20.79% | 22.61% | 21.22% | 26.01% | 23.47% | |
| Free Cash Flow Per Share | 6.04 | 5.85 | 5.46 | 4.56 | 4.94 | 3.12 | |
| Cash Income Tax Paid | 27,400 | 27,400 | 19,200 | 18,900 | 13,412 | 4,990 | |
| Levered Free Cash Flow | 64,363 | 56,581 | 56,280 | 49,939 | 47,009 | 35,504 | |
| Unlevered Free Cash Flow | 64,530 | 56,748 | 56,472 | 50,162 | 47,225 | 35,588 | |
| Change in Net Working Capital | -8,505 | 179 | -1,634 | -2,034 | 2,980 | -5,434 | |