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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense (benefit) | $ 2,947 | $ 3,570 | $ 5,801 | $ 7,442
Effective tax rate (as a percent) | 31.60% | 36.10% | 27.80% | 35.80%
Federal statutory rate (as a percent) |  |  | 35.00% |
Release of valuation allowance due to anticipated effects of the use of capital loss carryforwards | $ 716 |  | $ 716 |
Reduction in income tax expense | $ 364 |  | $ 364 |
Operating Loss Carryforwards [Line Items] |  |  |  |
Reduction in effective tax rate due to state tax credits and valuation allowance (as a percent) | 4.50% |  | 8.00% |
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | $ 10 |  | $ 10 |
ICP |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Equity method ownership percentage (percent) | 30.00% |  | 30.00% |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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