Guarantor Infromation (Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 13,409	$ 6,927
Accounts receivable - affiliates	0	0
Accounts receivable - trade	80,459	82,390
Inventories	187,240	218,130
Prepaid expenses and other current assets	23,634	21,157
Current assets of discontinued operations	92,873	98,281
Total current assets	397,615	426,885
Investment in affiliates	0	0
Net property, plant and equipment	537,298	551,163
Deferred income taxes	18,476	15,326
Goodwill	171,117	172,059
Notes receivable - affiliate	0	0
Other assets	147,767	152,613
Long-term assets of discontinued operations		103,975
Total assets	1,272,273	1,422,021
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable - affiliate	0	0
Accounts payable - trade	45,233	40,147
Short-term debt	16,482	4,772
Accrued income and other taxes	5,562	5,933
Rationalizations	401	1,195
Other accrued liabilities	25,063	20,994
Short-term liabilities of discontinued operations	19,315	23,082
Total current liabilities	112,056	96,123
Long-term debt - affiliate	0	0
Long-term debt - third party	363,975	362,455
Other long-term obligations	91,177	94,318
Deferred income taxes	47,609	57,430
Long-term liabilities of discontinued operations		1,167
Total stockholders' equity	657,456	810,528
Total liabilities and stockholders’ equity	1,272,273	1,422,021
Parent
ASSETS
Cash and cash equivalents	0	0
Accounts receivable - affiliates	51,592	51,592
Accounts receivable - trade	0	0
Inventories	0	0
Prepaid expenses and other current assets	0	0
Current assets of discontinued operations	0	0
Total current assets	51,592	51,592
Investment in affiliates	928,091	1,068,027
Net property, plant and equipment	0	0
Deferred income taxes	0	0
Goodwill	0	0
Notes receivable - affiliate	0	0
Other assets	0	0
Long-term assets of discontinued operations		0
Total assets	979,683	1,119,619
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable - affiliate	236	159
Accounts payable - trade	0	0
Short-term debt	0	0
Accrued income and other taxes	0	0
Rationalizations	0	0
Other accrued liabilities	2,444	2,444
Short-term liabilities of discontinued operations	0	0
Total current liabilities	2,680	2,603
Long-term debt - affiliate	48,586	38,661
Long-term debt - third party	270,961	267,827
Other long-term obligations	0	0
Deferred income taxes	0	0
Long-term liabilities of discontinued operations		0
Total stockholders' equity	657,456	810,528
Total liabilities and stockholders’ equity	979,683	1,119,619
Guarantors
ASSETS
Cash and cash equivalents	737	646
Accounts receivable - affiliates	3,657	9,803
Accounts receivable - trade	8,642	7,599
Inventories	44,003	54,613
Prepaid expenses and other current assets	8,146	7,913
Current assets of discontinued operations	79,908	81,638
Total current assets	145,093	162,212
Investment in affiliates	632,784	668,113
Net property, plant and equipment	201,677	209,633
Deferred income taxes	0	0
Goodwill	70,399	72,399
Notes receivable - affiliate	55,999	46,074
Other assets	75,300	79,367
Long-term assets of discontinued operations		99,457
Total assets	1,181,252	1,337,255
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable - affiliate	64,294	71,099
Accounts payable - trade	8,178	11,191
Short-term debt	11,341	4,636
Accrued income and other taxes	1,109	2,824
Rationalizations	384	995
Other accrued liabilities	6,190	4,847
Short-term liabilities of discontinued operations	17,006	18,384
Total current liabilities	108,502	113,976
Long-term debt - affiliate	0	0
Long-term debt - third party	87,105	93,758
Other long-term obligations	57,305	60,508
Deferred income taxes	249	248
Long-term liabilities of discontinued operations		738
Total stockholders' equity	928,091	1,068,027
Total liabilities and stockholders’ equity	1,181,252	1,337,255
Non-Guarantors
ASSETS
Cash and cash equivalents	12,672	6,281
Accounts receivable - affiliates	12,696	19,505
Accounts receivable - trade	71,817	74,791
Inventories	143,237	163,517
Prepaid expenses and other current assets	15,488	13,244
Current assets of discontinued operations	18,008	17,520
Total current assets	273,918	294,858
Investment in affiliates	0	0
Net property, plant and equipment	335,621	341,530
Deferred income taxes	18,476	15,326
Goodwill	100,718	99,660
Notes receivable - affiliate	0	0
Other assets	72,467	73,246
Long-term assets of discontinued operations		4,518
Total assets	801,200	829,138
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable - affiliate	3,415	9,642
Accounts payable - trade	37,055	28,956
Short-term debt	5,141	136
Accrued income and other taxes	4,453	3,109
Rationalizations	17	200
Other accrued liabilities	16,429	13,703
Short-term liabilities of discontinued operations	7,352	5,575
Total current liabilities	73,862	61,321
Long-term debt - affiliate	7,413	7,413
Long-term debt - third party	5,909	870
Other long-term obligations	33,872	33,810
Deferred income taxes	47,360	57,182
Long-term liabilities of discontinued operations		429
Total stockholders' equity	632,784	668,113
Total liabilities and stockholders’ equity	801,200	829,138
Consolidating Entries and Eliminations
ASSETS
Cash and cash equivalents	0	0
Accounts receivable - affiliates	(67,945)	(80,900)
Accounts receivable - trade	0	0
Inventories	0	0
Prepaid expenses and other current assets	0	0
Current assets of discontinued operations	(5,043)	(877)
Total current assets	(72,988)	(81,777)
Investment in affiliates	(1,560,875)	(1,736,140)
Net property, plant and equipment	0	0
Deferred income taxes	0	0
Goodwill	0	0
Notes receivable - affiliate	(55,999)	(46,074)
Other assets	0	0
Long-term assets of discontinued operations		0
Total assets	(1,689,862)	(1,863,991)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable - affiliate	(67,945)	(80,900)
Accounts payable - trade	0	0
Short-term debt	0	0
Accrued income and other taxes	0	0
Rationalizations	0	0
Other accrued liabilities	0	0
Short-term liabilities of discontinued operations	(5,043)	(877)
Total current liabilities	(72,988)	(81,777)
Long-term debt - affiliate	(55,999)	(46,074)
Long-term debt - third party	0	0
Other long-term obligations	0	0
Deferred income taxes	0	0
Long-term liabilities of discontinued operations		0
Total stockholders' equity	(1,560,875)	(1,736,140)
Total liabilities and stockholders’ equity	$ (1,689,862)	$ (1,863,991)