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Summary of Significant Accounting Policies (Cumulative Effect of the Changes Made to the Statement of Income for the Adoption of the New Revenue Standard) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 549,386 | $ 545,448 | $ 580,752 | $ 537,656 | $ 506,121 | $ 491,976 | $ 508,940 | $ 462,021 | $ 2,213,242 | $ 1,969,058 | $ 1,775,423
Total cost of revenue |  |  |  |  |  |  |  |  | 971,700 | 871,676 | 799,987
Gross profit | 300,361 | 305,643 | 332,439 | 303,099 | 272,474 | 274,002 | 292,715 | 258,191 | 1,241,542 | 1,097,382 | 975,436
Total operating expense |  |  |  |  |  |  |  |  | 750,207 |  |
Income from operations | $ 115,347 | $ 117,350 | $ 145,594 | $ 113,044 | $ 97,808 | $ 100,413 | $ 122,564 | $ 92,243 | 491,335 | 413,028 | 350,239
Interest expense |  |  |  |  |  |  |  |  | (34,744) | (37,225) | (32,049)
Interest income |  |  |  |  |  |  |  |  | 1,151 | 5,254 | 3,656
Income before provision for income taxes |  |  |  |  |  |  |  |  | 457,742 | 381,057 | 321,846
Provision for income taxes |  |  |  |  |  |  |  |  | 80,695 | 117,788 | 99,792
Net income |  |  |  |  |  |  |  |  | $ 377,047 | $ 263,269 | $ 222,054
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |
Basic (in USD per share) | $ 0.99 | $ 1.07 | $ 1.25 | $ 1.02 | $ 0.44 | $ 0.81 | $ 0.97 | $ 0.78 | $ 4.34 | $ 3.00 | $ 2.47
Diluted (in USD per share) | $ 0.98 | $ 1.05 | $ 1.23 | $ 1.01 | $ 0.43 | $ 0.79 | $ 0.95 | $ 0.77 | $ 4.26 | $ 2.94 | $ 2.44
Previous U.S. GAAP |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 2,154,902 |  |
Total cost of revenue |  |  |  |  |  |  |  |  | 936,302 |  |
Gross profit |  |  |  |  |  |  |  |  | 1,218,600 |  |
Total operating expense |  |  |  |  |  |  |  |  | 752,268 |  |
Income from operations |  |  |  |  |  |  |  |  | 466,332 |  |
Interest expense |  |  |  |  |  |  |  |  | (34,744) |  |
Interest income |  |  |  |  |  |  |  |  | 2,198 |  |
Income before provision for income taxes |  |  |  |  |  |  |  |  | 433,786 |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 74,865 |  |
Net income |  |  |  |  |  |  |  |  | 358,921 |  |
Accounting Standards Update 2014-09 | Attributed to the New Revenue Standard |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 58,340 |  |
Total cost of revenue |  |  |  |  |  |  |  |  | 35,398 |  |
Gross profit |  |  |  |  |  |  |  |  | 22,942 |  |
Total operating expense |  |  |  |  |  |  |  |  | (2,061) |  |
Income from operations |  |  |  |  |  |  |  |  | 25,003 |  |
Interest expense |  |  |  |  |  |  |  |  | 0 |  |
Interest income |  |  |  |  |  |  |  |  | (1,047) |  |
Income before provision for income taxes |  |  |  |  |  |  |  |  | 23,956 |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 5,830 |  |
Net income |  |  |  |  |  |  |  |  | $ 18,126 |  |

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