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Debt - Credit and Security Agreement (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 20, 2017 USD ($) | May 14, 2014 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 | Aug. 21, 2015 USD ($) | Aug. 19, 2015 USD ($) | May 31, 2015 USD ($)
2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.10 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  | 1.10
2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio remains at 1.15 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  | 1.15
2014 Credit Agreement, Fourth Amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letter of credit exposure outstanding |  |  |  |  |  | $ 17,000,000.0 |
Minimum | 2014 Credit Agreement, Third Amendment | Herley disposition proceeds reinvestment reserve, as defined in the amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Covenant terms, percentage of reinvestment in excess of loans and credit (percent) |  |  |  |  |  |  | 0.00%
Minimum | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.10 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Covenant terms, percentage of reinvestment in excess of loans and credit (percent) |  |  |  |  |  |  | 15.00%
Maximum | 2014 Credit Agreement, Third Amendment | Herley disposition proceeds reinvestment reserve, as defined in the amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Covenant terms, percentage of reinvestment in excess of loans and credit (percent) |  |  |  |  |  |  | 15.00%
Maximum | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.10 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Covenant terms, percentage of reinvestment in excess of loans and credit (percent) |  |  |  |  |  |  | 25.00%
Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 110,000,000.0 |  |  | $ 110,000,000.0 |  |
Debt term |  | 5 years |  |  |  |  |
Potential maximum borrowing capacity, subject to Lender approval |  | $ 135,000,000.0 |  |  |  |  |
Outstanding borrowings |  |  | $ 0 |  | $ 41,000,000 |  |
Remaining borrowing capacity |  |  | $ 65,800,000 |  |  |  |
Revolving Credit Facility | 2014 Credit Agreement, Third Amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Fixed charge coverage ratio |  | 1.15 |  |  |  |  |
Revolving Credit Facility | Amendment Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 90,000,000.0 |  |  |  |  |  |
Debt term | 5 years |  |  |  |  |  |
Potential maximum borrowing capacity, subject to Lender approval | $ 115,000,000.0 |  |  |  |  |  |
Percentage of Borrowing Base or Total Commitment Amount, less than |  |  |  | 50.00% |  |  |
Revolving Credit Facility | Minimum | 2014 Credit Agreement, Third Amendment | Herley |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Minimum amount required to repurchase |  |  |  |  |  |  | $ 175,000,000
Revolving Credit Facility | Federal Funds Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.50% |  |  |  |
Revolving Credit Facility | LIBOR Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.00% |  |  |  |
Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.00% |  |  |  |
Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.50% |  |  |  |
Revolving Credit Facility | Eurodollar Rate | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 2.00% |  |  |  |
Revolving Credit Facility | Eurodollar Rate | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 2.50% |  |  |  |
Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 50,000,000.0 |  |  |  |  |
Outstanding borrowings |  |  | $ 9,500,000 |  |  |  |
Letter of Credit | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio not measured |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Covenant terms, capacity of outstanding loans of credit |  |  |  |  |  |  | $ 17,000,000.0
Letter of Credit | Amendment Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 50,000,000.0 |  |  |  |  |  |
Swing Line Loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 10,000,000.0 |  |  |  |  |
Swing Line Loan | Amendment Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 10,000,000.0 |  |  |  |  |  |
Revolving Loans plus outstanding Swingline Loans plus Letters of Credit | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.05 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  | 1.05
Covenant terms, capacity of outstanding loans of credit |  |  |  |  |  |  | $ 17,000,000.0

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- Definition Line of Credit Facility, Covenant Terms, Minimum Percentage of Borrowing Base or Total Commitment Amount + 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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