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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net (loss) income $ (22,562) $ 12,324 $ 31,805
Adjustments to reconcile net (loss) income to net cash flows provided by (used in) operating activities:      
Depreciation and amortization 9,366 9,736 10,028
Recognition of deferred income from state and local incentives (2,219) (2,129) (1,415)
Gain on sale of railcars available for lease     (1,187)
Gain on sale of railcar repair and maintenance services business and facility     (4,578)
Gain on settlement of postretirement benefit plan obligation   (15,606)  
Deferred income taxes (6,424) 22,723 (2,679)
Stock-based compensation recognized 1,162 1,149 2,183
Other non-cash items, net 1,957 1,800 1,465
Changes in operating assets and liabilities:      
Accounts receivable 16,216 15,911 (38,398)
Inventories 50,639 17,056 (36,927)
Other assets (3,248) 2,992 (1,642)
Accounts and contractual payables (11,170) 260 137
Accrued payroll and employee benefits (1,305) (5,589) 2,033
Income taxes receivable/payable 9,623 (12,746) 6,374
Accrued warranty (262) (915) 497
Other liabilities (754) (8,690) (34,802)
Payment for settlement of postretirement benefit plan obligation   (31,616)  
Accrued pension costs and accrued postretirement benefits (678) (6,445) 1,421
Net cash flows provided by (used in) operating activities: 40,341 215 (65,685)
Cash flows from investing activities      
Purchase of restricted certificates of deposit (10,492) (6,370) (2,165)
Maturity of restricted certificates of deposit 10,742 7,296 1,284
Purchase of securities held to maturity (85,821)   (32,944)
Proceeds from maturity of securities 43,080 27,001 54,004
Purchase of property, plant and equipment (967) (13,846) (16,699)
Proceeds from sale of property, plant and equipment and railcars available for lease 119 2 7,654
Proceeds from sale of railcar repair and maintenance services business and facility     17,589
Cost of railcars available for lease     (8,724)
State and local incentives received 1,410   15,733
Net cash flows (used in) provided by investing activities: (41,929) 14,083 35,732
Cash flows from financing activities      
Deferred financing costs   (83)  
Stock option exercise     4,925
Employee stock settlement (23) (78) (1,052)
Excess tax benefit from stock-based compensation     35
Cash dividends paid to stockholders (3,351) (4,455) (4,419)
Net cash flows used in financing activities: (3,374) (4,616) (511)
Net (decrease) increase in cash and cash equivalents (4,962) 9,682 (30,464)
Cash and cash equivalents at beginning of year 92,750 83,068 113,532
Cash and cash equivalents at end of year 87,788 92,750 83,068
Supplemental cash flow information      
Interest paid 72 83 109
Income tax refunds received 11,929 4,096 646
Income taxes paid $ 104 $ 4,668 $ 13,371