| Income Taxes (Components of Provision (Benefit) for Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | |
| schedule of income tax expense [Line Items] | |||
| Settlements | $ 319 | $ 0 | $ 0 | 
| Current, federal | 59,213 | 87,386 | 53,840 | 
| Current, state and local | 9,959 | 443 | 6,370 | 
| Current, non-U.S. | 28,700 | 28,708 | 18,708 | 
| Current income tax expense | 97,872 | 116,537 | 78,918 | 
| Deferred, federal | (10,961) | 47,087 | (12,921) | 
| Deferred, state and local | (1,910) | 4,990 | (2,166) | 
| Deferred, non-U.S. | 768 | (14,195) | (5,372) | 
| Deferred income tax expense | (12,103) | 37,882 | (20,459) | 
| Income tax expense | $ 85,769 | $ 154,419 | $ 58,459 | 
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- Definition [Line Items] for schedule of income tax expense [Table] No definition available. 
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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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