Investments (Schedule Of Assets, Liabilities And Results Of Operations For Unconsolidated Joint Ventures) (Details) (Significant Unconsolidated Joint Ventures [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Significant Unconsolidated Joint Ventures [Member]
Schedule of Investments [Line Items]
Current assets	$ 307,358	$ 301,769
Noncurrent assets	174,431	170,622
Total assets	481,789	472,391
Current liabilities	112,589	135,622
Noncurrent liabilities	42,850	43,591
Total liabilities	155,439	179,213
Net sales	672,859	557,372	441,141
Gross profit	189,691	161,273	124,641
Income before income taxes	132,399	100,853	74,462
Net income	$ 88,414	$ 69,974	$ 49,575