Debt - Credit and Security Agreement (Details)			9 Months Ended
	Nov. 20, 2017 USD ($)	May 14, 2014 USD ($)	Sep. 30, 2018 USD ($)	Nov. 30, 2017	Aug. 20, 2015 USD ($)	May 31, 2015 USD ($)	May 31, 2014
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
2014 Credit Agreement, Third Amendment | Herley disposition proceeds reinvestment reserve, as defined in the amendment | Minimum
Line of Credit Facility [Line Items]
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)						0.00%
2014 Credit Agreement, Third Amendment | Herley disposition proceeds reinvestment reserve, as defined in the amendment | Maximum
Line of Credit Facility [Line Items]
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)						15.00%
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 of at least 1.10 | Minimum
Line of Credit Facility [Line Items]
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)						15.00%
2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.10 | Maximum
Line of Credit Facility [Line Items]
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)						25.00%
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
7% Senior Notes due 2019 | Senior notes
Line of Credit Facility [Line Items]
Fixed charge coverage ratio							2.0
Stated interest rate			7.00%
2014 Credit Agreement, Fourth Amendment
Line of Credit Facility [Line Items]
Letter of credit exposure outstanding					$ 17,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 110,000,000.0
Maturity period		5 years
Potential maximum borrowing capacity, subject to Lender approval		$ 135,000,000.0
Fixed charge coverage ratio		1.15
Outstanding borrowings			$ 0
Remaining borrowing capacity			$ 57,400,000
Revolving Credit Facility | Federal Funds Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate			0.50%
Revolving Credit Facility | LIBOR rate
Line of Credit Facility [Line Items]
Basis spread on variable rate			1.00%
Revolving Credit Facility | Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate			1.00%
Revolving Credit Facility | Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate			1.50%
Revolving Credit Facility | Eurodollar Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate			2.00%
Revolving Credit Facility | Eurodollar Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate			2.50%
Revolving Credit Facility | 2014 Credit Agreement, Third Amendment
Line of Credit Facility [Line Items]
Fixed charge coverage ratio		1.15
Revolving Credit Facility | 2014 Credit Agreement, Third Amendment | Herley | Minimum
Line of Credit Facility [Line Items]
Minimum amount required to repurchase						$ 175,000,000
Revolving Credit Facility | 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						0
Revolving Credit Facility | Amendment Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 90,000,000.0
Potential maximum borrowing capacity, subject to Lender approval	$ 115,000,000.0
Debt term	5 years
Percentage of borrowing base, less than				50.00%
Letter of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 50,000,000.0
Outstanding borrowings			$ 5,300,000
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
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 | 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						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]
Covenant terms, capacity of outstanding loans of credit						$ 17,000,000