CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Cash and restricted cash ($14,827 and $13,811 attributable to the variable interest entity ("VIE"))	$ 80,897	$ 79,140
Inventories	294,936	323,289
Property, plant and equipment, net	232,663	239,748
Goodwill	182,434	179,241
Other assets	31,907	32,247
Accounts payable	78,669	87,608
Accrued compensation and benefits	58,896	224,230
Accrued expenses and other liabilities	66,032	47,063
Accrued pension and postretirement benefits	139,892	135,339
Other noncurrent liabilities	$ 16,162	$ 14,101
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	74,451,977	74,093,598
Common stock, shares outstanding	74,451,977	74,093,598
VIE
Cash and restricted cash ($14,827 and $13,811 attributable to the variable interest entity ("VIE"))	$ 14,827	$ 13,811
Inventories	12,170	14,633
Property, plant and equipment, net	10,245	10,709
Goodwill	32,312	32,312
Other assets	2,624	2,642
Accounts payable	6,914	10,397
Accrued compensation and benefits	360	780
Accrued expenses and other liabilities	3,231	4,121
Accrued pension and postretirement benefits	1,723	1,946
Other noncurrent liabilities	$ 3,697	$ 3,368