Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 18,050	$ 18,894	$ 17,203
Charged to Cost and Expense	10,641	5,946	4,730
Reductions	(6,039)	(5,665)	(3,524)
Other	(637)	(1,125)	485
Balance at End of Year	22,015	18,050	18,894
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	171,365	141,252	14,063
Additions	118,277	30,113	133,431
Reductions	0	0	(6,242)
Other	0	0	0
Balance at End of Year	289,642	171,365	141,252
LIFO Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	35,835	50,769	50,705
Charged to Cost and Expense	686	221	4,166
Reductions	(6,896)	(15,155)	(4,102)
Other	0	0	0
Balance at End of Year	$ 29,625	$ 35,835	$ 50,769