CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Consolidated net income	$ 2,674	$ 153
Adjustments to reconcile consolidated net income to net cash used in operating activities:
Depreciation and amortization	33,078	30,839
Amortization of debt premium	(80)	(76)
Amortization of debt issuance costs	1,108	6,304
Gain on property, plant and equipment	(16)	(115)
Earnings from unconsolidated joint venture, net of dividends received	243	167
Deferred income tax benefit	(3,565)	(1,531)
Share-based compensation	6,194	4,530
Increase in:
Accounts receivable	(21,728)	(42,338)
Inventories of products, materials and supplies	(22,639)	(1,224)
Other assets	(4,827)	(1,818)
Increase (decrease) in:
Accounts payable-trade	(34,610)	(1,836)
Other payables and accruals	(2,921)	(8,880)
Other long-term liabilities	408	3,188
Due to related party	(4,877)	8,188
Net cash used in operating activities	(51,558)	(4,449)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property, plant and equipment	(52,975)	(34,742)
Purchase of software and other intangibles	(1,789)	(1,945)
Settlement of net investment hedge		(2,225)
Net cash used in investing activities	(54,764)	(38,912)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from debt	24,000	40,000
Repayments of debt	(24,000)	(136,875)
Capital lease payments	(4,495)	(950)
Contribution from noncontrolling interest		15,174
Purchase of treasury stock	(667)
Proceeds from the exercise of stock options	1,036	310
Debt issuance costs		(4,794)
Net cash used in financing activities	(4,126)	(87,135)
Effect of exchange rate differences on cash	467	(4,001)
Net decrease in cash and cash equivalents	(109,981)	(134,497)
Cash and cash equivalents, beginning of period	175,872	223,166
Cash and cash equivalents, end of period	65,891	88,669
Supplemental disclosures:
Cash paid during the period for income taxes, net of refunds received	8,665	5,463
Cash paid during the period for interest, net of capitalized interest	11,487	13,170
Capitalized interest	1,352	1,940
Supplemental non-cash disclosures:
Property, plant and equipment accruals	3,142	5,298
Asset acquired through capital lease	$ 7,033	$ 2,900