Organization and Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization and Summary of Significant Accounting Policies [Abstract]
Number of sales centers in North America, Europe, South America and Australia	328
Number of distribution networks	4
Shipping and handling costs associated with outbound freight	$ 38,674,000	$ 35,010,000	$ 33,964,000
Advertising expense	6,894,000	5,917,000	6,248,000
Gains (losses) on foreign currency transactions	(277,000)	(220,000)	111,000
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
Sales period (in months) for establishing reserve for inventory obsolescence - Tile and Parts	36 months
Depreciation expense	14,495,000	13,359,000	11,592,000
Measurement period for acquisition, maximum (in years)	1 year
Cumulative Share Repurchases	815,700,000
Cumulative Dividends	274,900,000
Controlling interest by parent	60.00%
Cash paid during the year for [Abstract]
Interest	6,481,000	5,963,000	5,495,000
Income taxes, net of refunds	$ 58,405,000	$ 47,138,000	$ 45,404,000