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Income Taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory income tax rate | $ 6,907 | $ (7,662) | $ (851)
U.S. state and local income taxes, net of U.S. federal income tax benefits | 1,430 | (1,075) | (69)
Unrecognized tax benefit | (9) | (603) | 589
Valuation allowance | 89 | 1,208 | 0
Non-taxable income | (1,055) | (1,267) | (696)
Provision to return adjustments | (1,277) | (4,167) | 442
Impact of the TCJA | (9,013) | 0 | 0
Change in state and foreign tax rates | (353) | 264 | 305
Foreign tax rate differentials | 974 | 143 | 145
Excess tax benefits from share-based awards | (493) | 0 | 0
Other non-deductible expenses | 666 | 897 | 541
Current and Deferred Income Tax Expense (Benefit) from Continuing Operations | $ (2,134) | $ (12,262) | $ 406
U.S. federal statutory income tax rate, percent | 35.00% | 35.00% | 35.00%
U.S. state and local income taxes, net of U.S. federal income tax benefits, percent | 7.20% | 4.90% | 2.80%
Unrecognized tax benefits, percent | 0.00% | 2.80% | (24.30%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | 0.50% | (5.50%) | 0.00%
Other, percent | (5.30%) | 5.80% | 28.70%
Adjustment to reflect prior year tax return filings, percent | (6.50%) | 19.00% | (18.20%)
Effective Income Tax Reconciliation, impact of the TCJA Tax Reform, Percent | (45.70%) | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | (1.80%) | (1.20%) | (12.50%)
Non-U.S. operations, percent | 4.90% | (0.70%) | (6.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent | (2.50%) | 0.00% | 0.00%
Business promotion and other non-deductible expenses, percent | 3.40% | (4.10%) | (22.20%)
Total income tax expense, percent | (10.80%) | 56.00% | (16.70%)

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