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Note 3 - Adoption of New Revenue Recognition Standard (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
Condensed Consolidated Balance Sheet Information |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2017 |
|  | As Reported |  |  | ASC 606 Adjustment |  |  | As Re casted |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Current Assets: |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  | $ | 51,141 |  |  | $ | (21,211 | ) |  | $ | 29,930 |
Prepaid and other current assets |  |  | 8,160 |  |  |  | 2,738 |  |  |  | 10,898 |
Total Current Assets |  |  | 242,384 |  |  |  | (18,473 | ) |  |  | 223,911 |
Other assets |  |  | 6,179 |  |  |  | 4,776 |  |  |  | 10,955 |
Total Assets |  | $ | 2,218,329 |  |  | $ | (13,697 | ) |  | $ | 2,204,632 |
Liabilities and Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Current Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  | $ | 117,963 |  |  | $ | (108 | ) |  | $ | 117,855 |
Deferred revenue |  |  | 38,266 |  |  |  | (23,258 | ) |  |  | 15,008 |
Total Current Liabilities |  |  | 170,604 |  |  |  | (23,366 | ) |  |  | 147,238 |
Deferred income taxes |  |  | 205,636 |  |  |  | 1,518 |  |  |  | 207,154 |
Other liabilities |  |  | 9,991 |  |  |  | 3,120 |  |  |  | 13,111 |
Total Liabilities |  |  | 1,546,913 |  |  |  | (18,728 | ) |  |  | 1,528,185 |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  | 723,354 |  |  |  | 5,032 |  |  |  | 728,386 |
Total Stockholders' Equity |  |  | 671,416 |  |  |  | 5,031 |  |  |  | 676,447 |
Total Liabilities and Stockholders' Equity |  | $ | 2,218,329 |  |  | $ | (13,697 | ) |  | $ | 2,204,632 |
|  | Three Months Ended March 31, 2017 |
|  | As Reported/ Re vised (1) |  |  | ASC 606 Adjustment |  |  | As Re casted |
Condensed Consolidated Statement of Operations and Comprehensive Income Information |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 207,427 |  |  | $ | 7 |  |  | $ | 207,434 |
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  | 46,256 |  |  |  | 129 |  |  |  | 46,385 |
Total costs and expenses |  |  | 148,729 |  |  |  | 129 |  |  |  | 148,858 |
Income from operations |  |  | 58,698 |  |  |  | (122 | ) |  |  | 58,576 |
Income before income taxes |  |  | 51,379 |  |  |  | (122 | ) |  |  | 51,257 |
Income tax provision |  |  | 19,190 |  |  |  | (46 | ) |  |  | 19,144 |
Net income |  | $ | 32,189 |  |  | $ | (76 | ) |  | $ | 32,113 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 5.68 |  |  | $ | (0.02 | ) |  | $ | 5.66 |
Diluted |  | $ | 5.62 |  |  | $ | (0.02 | ) |  | $ | 5.60 |
Comprehensive income |  | $ | 32,191 |  |  | $ | (76 | ) |  | $ | 32,115 |
Condensed Consolidated Statement of Cash Flows Information |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 32,189 |  |  | $ | (76 | ) |  | $ | 32,113 |
Change in deferred income taxes |  |  | (157 | ) |  |  | (46 | ) |  |  | (203 | )
Deferred revenue |  |  | 425 |  |  |  | 102 |  |  |  | 527 |
Other assets and liabilities, net |  |  | (415 | ) |  |  | 20 |  |  |  | (395 | )
Net cash provided by operating activities |  | $ | 78,260 |  |  | $ | - |  |  | $ | 78,260 |

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