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Long-Term Debt - Senior Secured Credit Facility - Revolver and Term Loan (Details) | Jun. 30, 2015 USD ($) bank | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 01, 2017 USD ($) | May 31, 2017 USD ($) | Nov. 30, 2016 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 253,873,000 |  | $ 202,168,000 |  |  |
Remaining borrowing capacity |  |  |  | 72,234,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, number of banks | bank | 2 |  |  |  |  |  |
Additional borrowing capacity (up to) | $ 25,000,000 |  |  |  |  |  |
Current borrowing capacity | $ 85,000,000 |  |  |  |  |  |
Total Funded Debt to EBITDA covenant ratio, maximum |  |  | 3.00 |  |  | 2.75 |
Long-term debt value, carrying value |  |  | $ 136,000,000 |  |  |  |
Amount outstanding |  | $ 1,696,000 |  | 27,580,000 |  |  |
Commitment fee percentage | 0.375% |  |  |  |  |  |
Debt interest rate |  | 4.52% |  |  |  |  |
Periodic principal payment | $ 1,500,000 |  |  |  |  |  |
Maximum amount of Company's consolidated stockholders' equity eligible for investment in or loan to non-core subsidiaries | 0.49 |  |  |  |  |  |
Minimum debt service coverage ratio | 1.5 |  |  |  |  |  |
Revolving Credit Facility | As of the end of each fiscal quarter ending September 30, 2016, December 31, 2016, March 31, 2017 and June 30, 2017 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum EBITDA requirement | 3 |  |  |  |  |  |
Revolving Credit Facility | Federal Funds Effective Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |
Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Current borrowing capacity | $ 20,000,000 |  |  |  |  |  |
Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 0.25% |  |  |  |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |
Term loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Additional borrowing capacity (up to) |  |  |  |  |  |  | $ 20,000,000
Current borrowing capacity |  |  | 46,000,000 |  | $ 75,000,000 | $ 60,000,000 | $ 30,000,000
Term loan | Notes payable to banks |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 41,500,000 |  | $ 22,500,000 |  |  |
Original principal amount | $ 46,000,000 |  |  |  |  |  |
Debt interest rate |  | 4.72% |  |  |  |  |
Term loan | Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  |  | 25,000,000 |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Current borrowing capacity |  |  | $ 85,000,000 |  |  | $ 75,000,000 |
Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 11,070,000 |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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