Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
LIFO inventory as a percent of total inventory		25.30%	30.60%
Excess of FIFO cost over LIFO		$ 14,500,000	$ 15,000,000
Share-based compensation expense		5,063,000	3,321,000	5,016,000
Non-cash compensation charges	$ 1,700,000	$ 700,000