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Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 2,908,812	$ 2,889,058	$ 2,943,462	$ 2,860,026	$ 2,920,405	$ 3,012,292	$ 2,672,195	$ 2,518,829	$ 11,601,358	$ 11,123,721	$ 10,887,612
Gross profit	432,066	435,101	438,163	419,763	425,675	431,420	404,892	383,522	1,725,093	1,645,509	1,595,069
Net income (loss)	$ 30,718	$ 34,777	$ 56,463	$ 35,814	$ 110,489	$ 29,881	$ 39,133	$ 33,939	$ 157,772	$ 213,442	$ 147,065
Basic earnings (loss) per share (in dollars per share)	$ 1.62	$ 1.74	$ 2.72	$ 1.70	$ 5.27	$ 1.43	$ 1.84	$ 1.58	$ 7.83	$ 10.08	$ 6.67
Diluted earnings (loss) per share (in dollars per share)	$ 1.62	$ 1.74	$ 2.72	$ 1.70	$ 5.27	$ 1.43	$ 1.84	$ 1.58	$ 7.83	$ 10.08	$ 6.67

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