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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Income before income taxes by geographic area was, for the years ended December 31:
(in thousands) |  | 2017 |  | 2016 |  | 2015
Federal |  | $ | 33,830 |  |  | $ | 39,419 |  |  | $ | 45,456 |
Foreign |  |  | (9,190 | ) |  |  | (1,074 | ) |  |  | (1,157 | )
|  | $ | 24,640 |  |  | $ | 38,345 |  |  | $ | 44,299 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The income tax provision consisted of the following for the years ended December 31:
(in thousands) |  | 2017 |  | 2016 |  | 2015
Current |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 7,020 |  |  | $ | 9,838 |  |  | $ | 12,433 |
State |  |  | 1,557 |  |  |  | 2,871 |  |  |  | 3,006 |
|  |  | 8,577 |  |  |  | 12,709 |  |  |  | 15,439 |
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (1,453 | ) |  |  | 2,491 |  |  |  | 1,553 |
Foreign |  |  | (875 | ) |  |  | 481 |  |  |  | (272 | )
State |  |  | (2,763 | ) |  |  | 1,233 |  |  |  | 277 |
|  |  | (5,091 | ) |  |  | 4,205 |  |  |  | 1,558 |
Income tax expense |  | $ | 3,486 |  |  | $ | 16,914 |  |  | $ | 16,997 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The differences between the U.S. federal statutory tax rate and the Company’s effective tax rate for continuing operations were as follows for the years ended December 31:
|  | 2017 |  | 2016 |  | 2015
U.S federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
Deferred balance adjustments due to Tax Act, net |  |  | (31.6 | ) |  |  | — |  |  |  | — |
State income taxes, net of U.S. federal income tax expense |  |  | 5.3 |  |  |  | 5.2 |  |  |  | 4.6 |
Change in valuation allowance |  |  | 6.4 |  |  |  | 1.6 |  |  |  | — |
Domestic production/manufacturing deduction |  |  | (1.6 | ) |  |  | (1.9 | ) |  |  | (2.4 | )
Tax differential on foreign earnings |  |  | 3.2 |  |  |  | 0.6 |  |  |  | 0.3 |
Deferred state tax adjustments, net |  |  | (2.4 | ) |  |  | 1.6 |  |  |  | — |
Non-deductible meals and entertainment |  |  | 1.7 |  |  |  | 1.0 |  |  |  | 0.6 |
Stock compensation excess tax benefits |  |  | (3.1 | ) |  |  | — |  |  |  | — |
Uncertain tax positions |  |  | 2.0 |  |  |  | — |  |  |  | (0.4 | )
Provision to return adjustments, net |  |  | (0.3 | ) |  |  | 0.8 |  |  |  | 0.5 |
Other income, net |  |  | (0.5 | ) |  |  | 0.2 |  |  |  | 0.2 |
Effective rate |  |  | 14.1 | % |  |  | 44.1 | % |  |  | 38.4 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The net deferred tax assets and (liabilities) arising from temporary differences was as follows at December 31:
(in thousands) |  | 2017 |  | 2016
Deferred income tax assets: |  |  |  |  |  |  |  |
Self insurance reserves |  | $ | 4,555 |  |  | $ | 6,670 |
Contract loss reserves |  |  | 317 |  |  |  | 257 |
Stock-based awards |  |  | 1,571 |  |  |  | 2,554 |
Bonus |  |  | 590 |  |  |  | 2,908 |
Non-U.S. operating loss |  |  | 2,173 |  |  |  | 595 |
Non-U.S. deferred income tax assets, net |  |  | 773 |  |  |  | — |
Other |  |  | 1,359 |  |  |  | 1,652 |
Total deferred income tax assets before valuation allowances |  |  | 11,338 |  |  |  | 14,636 |
Less: valuation allowances |  |  | (2,173 | ) |  |  | (595 | )
Total deferred income tax assets |  |  | 9,165 |  |  |  | 14,041 |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Property and equipment – tax over book depreciation |  |  | (18,792 | ) |  |  | (26,664 | )
Intangible assets – tax over book amortization |  |  | (2,186 | ) |  |  | (3,592 | )
Non-U.S. deferred income tax liabilities, net |  |  | — |  |  |  | (91 | )
Other |  |  | (1,639 | ) |  |  | (2,259 | )
Total deferred income tax liabilities |  |  | (22,617 | ) |  |  | (32,606 | )
Net deferred income taxes |  | $ | (13,452 | ) |  | $ | (18,565 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | The following is a reconciliation of the beginning and ending liability for unrecognized tax benefits at December 31:
(in thousands) |  | 2017 |  | 2016
Balance at beginning of period |  | $ | 301 |  |  | $ | 425 |
Gross increases in current period tax positions |  |  | 67 |  |  |  | 100 |
Gross increases in prior period tax positions |  |  | 441 |  |  |  | — |
Reductions in tax positions due to lapse of statutory limitations |  |  | (22 | ) |  |  | (12 | )
Settlements with taxing authorities |  |  | — |  |  |  | (243 | )
Balance at end of period |  |  | 787 |  |  |  | 270 |
Accrued interest and penalties at end of period |  |  | — |  |  |  | 31 |
Total liability for unrecognized tax benefits |  | $ | 787 |  |  | $ | 301 |

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