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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities      
Net income $ 15,060,000 $ 41,225,000 $ 42,609,000
Adjustments to reconcile net income to cash provided by (used in) operating activities:      
Depreciation and amortization 146,166,000 90,297,000 86,412,000
Bad debt expense 4,007,000 542,000 3,000,000
Equity in (earnings) losses of affiliates, net of dividends 7,671,000 (23,167,000) (10,494,000)
Loss (gain) on sales of assets (7,063,000) (5,218,000) (14,401,000)
Gains on sales of Rail Group assets and related leases (4,122,000) (9,558,000) (10,990,000)
Stock based compensation expense 16,229,000 6,624,000 6,097,000
Deferred income tax 5,114,000 11,018,000 (63,234,000)
Goodwill impairment 0 0 59,081,000
Asset impairment 41,212,000 6,272,000 10,913,000
Gain from remeasurement of equity method investments, net (35,214,000) 0 0
Other 3,540,000 (1,451,000) (55,000)
Changes in operating assets and liabilities:      
Accounts receivable 1,487,000 (24,788,000) 9,781,000
Inventories (1,578,000) (44,060,000) 16,141,000
Commodity derivatives 21,714,000 (16,610,000) 20,285,000
Other assets 30,497,000 3,290,000 (74,237,000)
Payables and other accrued expenses 103,842,000 (69,935,000) (5,623,000)
Net cash provided by (used in) operating activities 348,562,000 (35,519,000) 75,285,000
Investing Activities      
Acquisition of businesses, net of cash acquired (102,580,000) (2,248,000) (3,507,000)
Purchases of Rail Group assets (105,254,000) (167,005,000) (143,020,000)
Proceeds from sale of Rail Group assets 18,090,000 79,439,000 36,896,000
Purchases of property, plant and equipment and capitalized software (165,223,000) (142,579,000) (34,602,000)
Proceeds from sale of assets and businesses 30,617,000 47,486,000 33,879,000
Proceeds from returns of investments in affiliates 0 0 1,069,000
Purchase of investments (1,490,000) (1,086,000) (5,679,000)
Other 808,000 0 1,470,000
Net cash used in investing activities (325,032,000) (185,993,000) (113,494,000)
Financing Activities      
Net change in short-term borrowings (278,824,000) 183,000,000 (8,059,000)
Proceeds from issuance of long-term debt 922,594,000 132,000,000 85,175,000
Payments of long-term debt (608,483,000) (121,090,000) (57,189,000)
Proceeds from long-term financing agreements 0 0 12,195,000
Proceeds from noncontrolling interest owner 4,714,000 46,736,000 (377,000)
Payments of debt issuance costs (6,561,000) (1,446,000) (2,024,000)
Payments to acquire noncontrolling interest 0 (10,000,000) 0
Dividends paid (22,118,000) (18,639,000) (18,152,000)
Other (2,615,000) (1,375,000) (1,071,000)
Net cash provided by financing activities 8,707,000 209,186,000 10,498,000
Effect of exchange rates on cash, cash equivalents and restricted cash 65,000 0 0
Increase (decrease) in cash, cash equivalents and restricted cash 32,302,000 (12,326,000) (27,711,000)
Cash, cash equivalents and restricted cash at beginning of year 22,593,000 34,919,000 62,630,000
Cash, cash equivalents and restricted cash at end of year $ 54,895,000 $ 22,593,000 $ 34,919,000