Summary Of Significant Accounting Policies Summary of Adoption of 606 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 341,136	$ 316,415		$ 449,382
Inventories	520,614	405,971		521,827
Prepaid expenses and other current assets	73,850	72,788		79,500
Total current assets	1,638,650	1,603,368		1,765,306
Total assets	2,613,709	2,188,684	$ 2,721,400	2,368,721
Accrued liabilities	224,385	206,145	272,338	275,684
Total current liabilities	479,844	383,734	626,743	572,882
Total liabilities	893,060	497,331	1,031,087	678,408
Total liabilities and equity	2,613,709	2,188,684	$ 2,721,400	$ 2,368,721
Net sales	654,608	607,308
Gross profit	336,729	299,438
Selling, general and administrative expenses	$ 251,755	$ 243,368