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Segment Information (Schedule of Revenue by Geographic Location) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net | $ 726,934 | $ 648,023 | $ 710,545 | $ 720,189 | $ 729,597 | $ 634,646 | $ 684,832 | $ 706,579 | $ 2,805,691 | $ 2,755,654 | $ 2,580,935
North America [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 2,244,057 | 2,215,430 |
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 369,815 | 384,234 |
Other Geographic Locations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | $ 191,819 | $ 155,990 |

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