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Summary of Significant Accounting Policies (Cumulative Effect of the Changes Made to the Statement of Cash Flows for the Adoption of the New Revenue Standard) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income | $ 377,047 | $ 263,269 | $ 222,054
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Benefit of deferred income taxes | 1,209 | $ (7,918) | $ 20,881
All other adjustments to reconcile net income to net cash provided by operating activities | 113,468 |  |
Changes in assets and liabilities, net | (91,640) |  |
Net cash provided by operating activities | 400,084 |  |
Previous U.S. GAAP |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income | 358,921 |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Benefit of deferred income taxes | 3,482 |  |
All other adjustments to reconcile net income to net cash provided by operating activities | 113,468 |  |
Changes in assets and liabilities, net | (75,787) |  |
Net cash provided by operating activities | 400,084 |  |
Accounting Standards Update 2014-09 | Attributed to the New Revenue Standard |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income | 18,126 |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Benefit of deferred income taxes | (2,273) |  |
All other adjustments to reconcile net income to net cash provided by operating activities | 0 |  |
Changes in assets and liabilities, net | (15,853) |  |
Net cash provided by operating activities | $ 0 |  |

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