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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Effective income tax | (34.30%) | (29.50%) |
Deferred tax assets, net | $ 1,028,414 |  | $ 1,049,408
Gross unrecognized tax benefits | 20,700 |  | 21,502
Accrued interest and penalties on unrecognized tax benefits | 11,800 |  | 12,200
Possible decrease in unrecognized tax benefits | $ 17,300 |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Retained Earnings | Accounting Standards Update 2016-09, Excess Tax Benefit Component [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income tax assets, net |  |  | $ 18,600

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