Organization and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Number of sales centers in North America, Europe, South America and Australia	364
Number of distribution networks	4
Advertising expense	$ 7,390,000	$ 7,477,000	$ 7,011,000
Gains (losses) on foreign currency transactions	(560,000)	171,000	(679,000)
Threshold past due account balances for reserve analysis	$ 20,000
Threshold past due days for reserve analysis	60 days
Sales period (in months) for establishing reserve for inventory obsolescence	12 months
Depreciation expense	$ 26,122,000	24,157,000	20,338,000
Cumulative Share Repurchases	1,426,765,000
Cumulative Dividends	$ 495,099,000
Controlling interest by parent	60.00%
Cash paid during the year for [Abstract]
Interest	$ 17,796,000	12,957,000	8,052,000
Income taxes, net of refunds	50,091,000	84,251,000	80,378,000
Shipping and Handling Costs
Business Acquisition [Line Items]
Shipping and handling costs associated with outbound freight	$ 48,610,000	$ 45,247,000	$ 39,879,000