Income Taxes (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
Dec. 31, 2015 |
|
| Income Tax Contingency [Line Items] | |||
| Effective income tax (percent) | 29.50% | 42.60% | |
| Deferred Tax Assets, Net | $ 1,344,853 | $ 1,394,879 | |
| Gross unrecognized tax benefits | 22,500 | 39,000 | |
| Accrued interest and penalties on unrecognized tax benefits | 11,800 | $ 17,200 | |
| Possible decrease in unrecognized tax benefits | $ 18,500 | ||
| Minimum | |||
| Income Tax Contingency [Line Items] | |||
| Income tax years under examination | 2005 | ||
| Maximum | |||
| Income Tax Contingency [Line Items] | |||
| Income tax years under examination | 2016 | ||