Segment Information (Schedule of Revenue by Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues, net (including revenues, net from related parties of $5,578, $6,168 and $15,873, respectively)	$ 772,846	$ 696,875	$ 761,385	$ 740,823	$ 726,934	$ 648,023	$ 710,545	$ 720,189	$ 2,971,929	$ 2,805,691	$ 2,755,654
North America [Member]
Segment Reporting Information [Line Items]
Revenues, net (including revenues, net from related parties of $5,578, $6,168 and $15,873, respectively)									2,389,624	2,244,057
Europe [Member]
Segment Reporting Information [Line Items]
Revenues, net (including revenues, net from related parties of $5,578, $6,168 and $15,873, respectively)									394,235	369,815
Other Geographic Locations [Member]
Segment Reporting Information [Line Items]
Revenues, net (including revenues, net from related parties of $5,578, $6,168 and $15,873, respectively)									$ 188,070	$ 191,819