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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Taxes [Abstract] |
Composition of Income Tax Expense |
﻿ |  |  |  |  |
﻿ | Year Ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Current taxes |  |  |  |  |
﻿Federal | $ (2,230) |  | $ (15,747) |  | $ 16,709
﻿State | (187) |  | (486) |  | 751
﻿ | (2,417) |  | (16,233) |  | 17,460
﻿Deferred taxes |  |  |  |  |
﻿Federal | (4,703) |  | 23,869 |  | (2,767)
﻿State | (1,721) |  | (1,146) |  | 88
﻿ | (6,424) |  | 22,723 |  | (2,679)
﻿Tax (benefit) expense related to a (decrease) increase in unrecognized tax benefits | (57) |  | (1,120) |  | 59
﻿Interest expense, gross of related tax effects | 53 |  | (1,906) |  | (9)
﻿Total (benefit) provision | $ (8,845) |  | $ 3,464 |  | $ 14,831
﻿
Reconciliation of Income Tax Rate |
﻿ |  |  |  |  |
﻿ | Year Ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Statutory U.S. federal income tax rate | 35.0% |  | 35.0% |  | 35.0%
﻿State income taxes, net of federal tax benefit | 3.4% |  | 3.4% |  | 3.2%
﻿Valuation allowance | 0.1% |  | (2.6)% |  | (1.0)%
﻿Enactment of the Tax Cuts and Jobs Act | (8.0)% |  | 0.0% |  | 0.0%
﻿Domestic manufacturing deduction | (1.0)% |  | 7.6% |  | (3.6)%
﻿State rate and other changes in deferred taxes | (1.3)% |  | (1.9)% |  | 0.4%
﻿Federal and state credits | 0.1% |  | (4.8)% |  | (2.7)%
﻿Uncertain tax positions | (0.3)% |  | (16.1) % |  | 0.4%
﻿Nondeductible expenses and other | 0.2% |  | 1.3% |  | 0.1%
﻿Effective income tax rate | 28.2% |  | 21.9% |  | 31.8%
﻿
Components of Deferred Tax Assets and Liabilities |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  | December 31, 2017 |  | December 31, 2016
﻿Description |  |  | Assets |  | Liabilities |  | Assets |  | Liabilities
﻿ |  |  |  |  |  |  |  |  |
﻿Accrued postretirement and pension benefits |  |  | $ 2,545 |  | $ - |  | $ 4,624 |  | $ -
﻿Intangible assets |  |  | - |  | (1,669) |  | - |  | (2,838)
﻿Accrued expenses |  |  | 4,104 |  | - |  | 6,961 |  | -
﻿Deferred state and local incentive revenue |  |  | 2,933 |  | - |  | 4,733 |  | -
﻿Inventory valuation |  |  | 1,869 |  | - |  | 2,621 |  | -
﻿Property, plant and equipment and railcars on operating leases |  |  | - |  | (8,957) |  | - |  | (14,897)
﻿Net operating loss and tax credit carryforwards |  |  | 13,371 |  | - |  | 5,731 |  | -
﻿Stock-based compensation expense |  |  | 807 |  | - |  | 2,825 |  | -
﻿Other |  |  | 1,085 |  | (379) |  | 419 |  | (761)
﻿ |  |  | 26,714 |  | (11,005) |  | 27,914 |  | (18,496)
﻿Valuation allowance |  |  | (6,263) |  | - |  | (5,197) |  | -
﻿Deferred tax assets (liabilities) |  |  | $ 20,451 |  | $ (11,005) |  | $ 22,717 |  | $ (18,496)
﻿Increase (decrease) in valuation allowance |  |  | $ 1,066 |  |  |  | $ (600) |  |
﻿
Reconciliation of Unrecognized Tax Benefits |
﻿ |  |  |  |  |
﻿ | 2017 |  | 2016 |  | 2015
﻿Beginning of year balance | $ 1,572 |  | $ 2,503 |  | $ 2,444
﻿Increases in prior period tax positions | - |  | 13 |  | -
﻿Decreases in prior period tax positions | (189) |  | (1,924) |  | -
﻿Increases in current period tax positions | - |  | 980 |  | 59
﻿End of year balance | $ 1,383 |  | $ 1,572 |  | $ 2,503
﻿
Income Tax Years Subject to Examination |
﻿ |
﻿Jurisdiction | Earliest Year Open to Examination
﻿U.S. Federal | 2010
﻿States: |
﻿Pennsylvania | 2000
﻿Texas | 2013
﻿Illinois | 2010
﻿Virginia | 2014
﻿Colorado | 2010
﻿Indiana | 2010
﻿Nebraska | 2010
﻿Alabama | 2014
﻿Foreign: |
﻿ China | 2015
﻿

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