Long-term Debt, Line of Credit and Derivatives - Obligations under Debt Arrangements (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended
	May 31, 2019	Mar. 31, 2019	Jul. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of debt issuance costs				$ 123	$ 84
Net Value, current				4,040		$ 3,668
Net Value, long-term				66,030		68,029
Total debt				$ 70,070		71,697
Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate				4.44%
Principal current				$ 4,125		3,750
Principal, long-term				67,415		69,540
Principal				71,540		73,290
Deferred Finance Costs, current				(85)		(82)
Deferred Issuance Costs, long-term				(1,385)		(1,511)
Debt Issuance Costs, Net, Total				(1,470)		(1,593)
Revolving Credit Facility
Debt Instrument [Line Items]
Net Value, long-term				34,281		35,218
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				50,000
Debt issuance expense	$ 400
Principal, long-term				35,000		36,000
Deferred Issuance Costs, long-term				(719)		(782)
Term Loan
Debt Instrument [Line Items]
Net Value, current				4,040		3,668
Net Value, long-term				31,749		32,811
Term Loan | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				60,000
Principal current				4,125		3,750
Principal, long-term				32,415		33,540
Principal				36,540
Deferred Finance Costs, current				(85)		(82)
Deferred Issuance Costs, long-term				(666)		$ (729)
Fourth, Fifth And Sixth Amendments To Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Debt Issuance Costs, Net, Total				$ (900)
Fourth Amendment to Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Debt issuance cost			$ 900
Fifth Amendment To Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Debt issuance cost		$ 600
Sixth Amendment To Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Debt issuance cost	$ 900