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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Examination [Line Items] |  |  |
Estimated reduction in deferred tax liabilities | $ (4,300,000) |  |
Income tax payable | 2,833,000 | $ 0 |
Decrease in net deferred tax liability related to acquisitions of non-controlling interests | (1,200,000) |  |
Charge to current year provision for income taxes | 300,000 |  |
Offset to adjustment, reduction in the previously reported tax receivable |  | 1,700,000 |
Reduction of the income tax provision | 1,300,000 | 1,000,000 |
Increase in current state income tax provision | 312,000 | 34,000 | $ 147,000
Accrued interest and penalties associated with any unrecognized tax benefits | 0 | 0 | 0
Interest expense recognized | 0 | 0 | $ 0
Federal [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Income tax payable | $ 2,800,000 |  |
Offset to adjustment, reduction in the previously reported tax receivable |  | 1,100,000 |
Tax receivable included in other current assets |  | 700,000 |
Federal [Member] | Minimum [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Periods open for examination | 2014 |  |
Federal [Member] | Maximum [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Periods open for examination | 2016 |  |
State [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Offset to adjustment, reduction in the previously reported tax receivable |  | 600,000 |
Tax receivable included in other current assets | $ 2,200,000 | $ 1,500,000 |
State [Member] | Minimum [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Periods open for examination | 2013 |  |
State [Member] | Maximum [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Periods open for examination | 2016 |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(b)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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