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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income (loss) $ 1,651 $ (19,816)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:    
Depreciation and amortization 26,083 18,145
Amortization of debt issuance costs and debt discount 4,020 3,665
Deferred income taxes (2,934) (20,387)
Stock-based compensation 2,511 2,263
Undistributed equity in loss of affiliates   1,675
Other 23 103
Changes in operating assets and liabilities before effects of business combinations:    
Accounts receivable 50,486 (10,036)
Inventories (41,911) (9,562)
Derivative financial instruments 9,138 (1,797)
Prepaid expenses and other assets (1,228) 760
Accounts payable and accrued liabilities (86,420) (49,190)
Current income taxes 178 3,216
Other (9) 1,154
Net cash used by operating activities (38,412) (79,807)
Cash flows from investing activities:    
Purchases of property and equipment (14,902) (18,571)
Acquisition of a business, net of cash acquired (4,074)  
Distributions from (investments in) unconsolidated subsidiaries (2,399) 260
Net cash used by investing activities (21,375) (18,311)
Cash flows from financing activities:    
Proceeds from the issuance of long-term debt 14,700 56,000
Payments of principal on long-term debt (46,845) (5,947)
Proceeds from short-term borrowings 1,100,076 954,363
Payments on short-term borrowings (1,055,664) (906,115)
Payments of cash dividends and distributions (9,461) (9,248)
Change in restricted cash 12,989 9,756
Payments related to tax withholdings for stock-based compensation (3,801) (2,116)
Proceeds from exercise of stock options 50  
Net cash provided by financing activities 12,044 96,693
Net change in cash and cash equivalents (47,743) (1,425)
Cash and cash equivalents, beginning of period 304,211 384,867
Cash and cash equivalents, end of period 256,468 383,442
Supplemental disclosures of cash flow    
Cash paid for income taxes 336 2,276
Cash paid for interest $ 15,804 $ 9,343