Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 18,894	$ 17,203	$ 17,005
Charged to Cost and Expense	5,946	4,730	5,869
Reductions	(5,665)	(3,524)	(5,427)
Other	(1,125)	485	(244)
Balance at End of Year	18,050	18,894	17,203
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	141,252	14,063	17,275
Additions	30,113	133,431	0
Reductions	0	(6,242)	(3,212)
Other	0	0	0
Balance at End of Year	171,365	141,252	14,063
LIFO Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	50,769	50,705	53,374
Charged to Cost and Expense	221	4,166	0
Reductions	(15,155)	(4,102)	(2,669)
Other	0	0	0
Balance at End of Year	$ 35,835	$ 50,769	$ 50,705