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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (New Accounting Pronouncements And Changes In Accounting Principle) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase to net cash provided by operating activities | $ 459,898 | $ 434,220 | $ 407,516 |
Corresponding offset to net cash used for financing activities | 253,633 | 328,672 | 305,861 |
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase to net cash provided by operating activities |  | 8,984 | 16,056 |
Corresponding offset to net cash used for financing activities |  | (8,984) | (16,056) |
Increase to deferred tax assets |  |  |  | $ 913
Accounting Standards Update 2014-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Research services by SIDCO recorded as expense | 14,623 | 18,409 | 20,333 |
Additional Paid-in Capital [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cumulative-effect adjustment | (2,582) | 0 | 0 |
Additional Paid-in Capital [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cumulative-effect adjustment |  |  |  | (2,582)
Retained Earnings [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cumulative-effect adjustment | $ 1,669 | $ 0 | $ 0 |
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cumulative-effect adjustment |  |  |  | $ 1,669

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