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Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Jan. 01, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Net cash used in financing activities | $ (6,163) | $ (44,797) |
Net cash provided by operations | $ 89,890 | 228,584 |
Accounting Standards Update 2016-09 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Net cash used in financing activities |  | 600 |
Net cash provided by operations |  | $ 600 |
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] |  |  |
New Accounting Pronouncement Or Change In Accounting Principle Retrospective Adjustments [Abstract] |  |  |
Net cumulative effect adjustment |  |  | $ 200
Accounting Standards Update 2016-09 [Member] | Additional Paid In Capital [Member] |  |  |
New Accounting Pronouncement Or Change In Accounting Principle Retrospective Adjustments [Abstract] |  |  |
Net cumulative effect adjustment |  |  | $ 200

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