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Long-Term Debt and Credit Facility - Additional Disclosures (Details) - USD ($) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2017 | May 22, 2017 | Dec. 31, 2016 | May 10, 2013
Line of Credit Facility [Line Items] |  |  |  |  |
Amount borrowed |  | $ 42,716,000 |  | $ 48,399,000 |
Term loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amount borrowed |  | 0 |  | $ 9,833,000 |
Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Limit on capital expenditures |  | $ 20,000,000 |  |  |
Covenant, percent of adjusted EBITDA which must be prepaid |  | 25.00% |  |  |
Credit facility ceiling value applicable to 25% of adjusting EBITDA which must be paid |  | $ 3,000,000.0 |  |  |
Covenant, maximum number of days from year end by which prepayment of 25% of adjusted EBITDA is due |  | 60 days |  |  |
Credit Facility | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 65,000,000
Credit Facility | Line of Credit | Borrowings under revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 55,000,000
Credit facility, availability |  | $ 64,900,000 |  |  |
Credit facility, available borrowing capacity, net of outstanding borrowings |  | $ 22,200,000 |  |  |
Credit facility, commitment fee percentage |  | 0.25% |  |  |
Credit facility, amount outstanding |  | $ 42,700,000 |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | PNC Bank Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Base lending rate |  | 4.25% |  |  |
Credit facility, amount outstanding |  | $ 7,700,000 |  |  |
Credit facility, interest rate at period end |  | 5.75% |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility, amount outstanding |  | $ 35,000,000 |  |  |
Credit facility, interest rate at period end |  | 3.73% |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Fixed coverage charge ratio requirement |  | 1.00 |  |  |
Leverage ratio requirement |  | 4.0 |  |  |
Undrawn availability required |  | $ 10,000,000 |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum | PNC Bank Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility, variable percentage rate spread |  | 1.50% |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility, variable percentage rate spread |  | 2.50% |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Fixed coverage charge ratio requirement |  | 1.10 |  |  |
Leverage ratio requirement |  | 5.5 |  |  |
Undrawn availability required |  | $ 15,000,000 |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum | PNC Bank Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility, variable percentage rate spread |  | 2.00% |  |  |
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility, variable percentage rate spread |  | 3.00% |  |  |
Credit Facility | Term loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt, face amount | $ 10,000,000 |  |  |  | 10,000,000
Monthly principal payments | $ 200,000 |  |  |  |
Credit Facility | Letter of Credit | Borrowings under revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 65,000,000 |  | $ 10,000,000

X
- Definition Covenant, Maximum Number of Days From Year End By Which Prepayment of 25% of Adjusted EBTDA is Due + References No definition available. + Details
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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://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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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